Journal articles: 'Modelo t de Student'

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Thomaz, Paulo Siga, Viviane Leite Dias de Mattos, Luiz Ricardo Nakamura, Andréa Cristina Konrath, and Gérson Dos Santos Nunes. "Modelos GARCH em ações financeiras: um estudo de caso." Exacta 18, no. 3 (July 10, 2020): 626–48. http://dx.doi.org/10.5585/exactaep.v18n3.10921.

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Este artigo tem por objetivo detalhar o protocolo de aplicação e avaliação dos modelos autorregressivos de heteroscedasticidade condicional generalizados (GARCH), com ênfase em especificar adequadamente a distribuição de probabilidade para os resíduos e o critério de avaliação da previsão. Com este intuito, aplicam-se modelos GARCH com distribuição normal e t de Student na modelagem da volatilidade da série de retornos das ações ABEV3. O melhor modelo seguindo a distribuição normal e o melhor seguindo a distribuição t de Student são executados para a previsão, em que os resultados são comparados com a volatilidade realizada, calculada a partir de retornos intradiários, e com os retornos absolutos. Os resultados evidenciam que o modelo GARCH(1,1) seguindo a distribuição t de Student possui a melhor performance, tanto no ajuste como na previsão. Além disso, os modelos possuem resultados significativamente melhores quando avaliados pelo critério da volatilidade realizada.

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Hernández García, Melva. "Cultura organizacional y habilidades gerenciales de los directores y profesores, en una asociación educativa." Paidagogo 2, no. 1 (June 6, 2020): 3–25. http://dx.doi.org/10.52936/p.v2i1.22.

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El objetivo de esta investigación es determinar en qué medida la cultura organizacional se relaciona con las habilidades gerenciales, en un enfoque cuantitativo, no experimental, tipos: descriptivo, correlacional y transeccional. En el primer modelo, las dimensiones predictoras “modos de vida” y “conocimiento” influyen positivamente en la dimensión “habilidades técnicas”, pues sus t de Student respectivamente: t= 3.162 y t= 2,652 tiene p-valores 0.003 y 0,011, inferiores a 0.05. En el segundo modelo, las dimensiones predictoras “práctica de valores”, “modos de vida” y “conocimiento” influyen positivamente en la dimensión “habilidades humanas”, pues sus t de Student respectivamente: t= 2.872, t = 3.158 y t= 3.034, con sus p-valores 0.006, 0.003 y 0,004, inferiores a 0.05. En el tercer modelo, las dimensiones predictoras “conocimiento”, “modos de vida” y “práctica de valores” influyen positivamente en la dimensión “habilidades conceptuales”, pues sus t de Student respectivamente: t= 3.662, t = 2.789 y t= 2,250, con p-valores 0.001, 0.008 y 0,030, inferiores a 0.05. Finalmente, en modelo general, la variable predictora “cultura organizacional” influye positivamente en la variable criterio “habilidades gerenciales”, pues su t de Student 9.879, con un p-valor de 0.000, inferior a 0.05. En conclusión, la cultura organizacional se relaciona positivamente con las habilidades gerenciales.

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Sales, Francisco Das Chagas Vieira, José Antonio Aleixo da Silva, Rinaldo Luiz Caraciolo Ferreira, and Fernando Henrique de Lima Gadelha. "AJUSTES DE MODELOS VOLUMÉTRICOS PARA O CLONE Eucalyptus grandis x E. urophylla CULTIVADOS NO AGRESTE DE PERNAMBUCO." FLORESTA 45, no. 4 (October 16, 2015): 663. http://dx.doi.org/10.5380/rf.v45i4.37594.

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O presente trabalho teve como objetivo avaliar o ajuste de modelos volumétricos para um clone de Eucalyptus usando distribuição normal e t-Student, utilizando dados de um experimento implantado no Instituto Agronômico de Pernambuco (IPA) em São Bento do Una, PE. Para o ajuste dos modelos volumétricos de Silva e Bailey modificado, Chapman e Richard modificado, Schumacher e Hall e, Brody modificado, foram utilizados dados de 62 árvores cubadas rigorosamente pelo método de Smalian. Os critérios usados nas comparações das equações foi o valor ponderado (VP) entre o Índice de Ajuste corrigido (IAc) e o erro percentual absoluto médio (EPAM). De acordo com os resultados o modelo que mostrou melhores ajustes nas duas distribuições foi o de Schumacher e Hall, com melhores ajuste quando da distribuição t-Student. A distribuição t-Student promoveu melhorias nos ajustes das equações em relação à distribuição Normal, quando comparando as duas distribuições em cada equação.AbstractAdjustment of volumetric models for clone of Eucalyptus grandis x E. Urophylla grown on agreste, Pernambuco. This research aimed to evaluate the volumetric models fitting for Eucalyptus clone using normal and t-Student distributions, based on data from an experiment implanted at the Agronomic Institute of Pernambuco (IPA) in São Bento do Una, PE. In order to set the modified volumetric models of Silva and Bailey, modified Chapman and Richard, Schumacher and Hall, and modified Brody, we used data from 62 trees rigorously scaled by Smalian method. The criteria for equation comparing were the weighted value (PV) between the corrected index adjustment (IAc) and absolute mean error percentage (EPAM). According to the results, the model that best fits for the two distributions is Schumacher and Hall, with better adjustment related to the Student-t distribution. The t-Student distribution promoted improvements of equations regarding the Normal distribution, compared to the two distributions per equation.Keywords: Forest management; symmetric distributions; volume equations.

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Nugroho, Didit Budi, Agus Priyono, and Bambang Susanto. "SKEW NORMAL AND SKEW STUDENT-T DISTRIBUTIONS ON GARCH(1,1) MODEL." MEDIA STATISTIKA 14, no. 1 (April 16, 2021): 21–32. http://dx.doi.org/10.14710/medstat.14.1.21-32.

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The Generalized AutoRegressive Conditional Heteroskedasticity (GARCH) type models have become important tools in financial application since their ability to estimate the volatility of financial time series data. In the empirical financial literature, the presence of skewness and heavy-tails have impacts on how well the GARCH-type models able to capture the financial market volatility sufficiently. This study estimates the volatility of financial asset returns based on the GARCH(1,1) model assuming Skew Normal and Skew Student-t distributions for the returns errors. The models are applied to daily returns of FTSE100 and IBEX35 stock indices from January 2000 to December 2017. The model parameters are estimated by using the Generalized Reduced Gradient Non-Linear method in Excel’s Solver and also the Adaptive Random Walk Metropolis method implemented in Matlab. The estimation results from fitting the models to real data demonstrate that Excel’s Solver is a promising way for estimating the parameters of the GARCH(1,1) models with non-Normal distribution, indicated by the accuracy of the estimation of Excel’s Solver. The fitting performance of models is evaluated by using log-likelihood ratio test and it indicates that the GARCH(1,1) model with Skew Student-t distribution provides the best fitting, followed by Student-t, Skew-Normal, and Normal distributions.

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Prado, Naimara V. do, Miguel A. Uribe-Opazo, Manuel Galea, and Rosangela A. B. Assumpção. "Influência local em um modelo espacial linear da produtividade da soja utilizando distribuição t-Student." Engenharia Agrícola 33, no. 5 (October 2013): 1003–16. http://dx.doi.org/10.1590/s0100-69162013000500012.

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O uso das ferramentas da geoestatística, aliadas à agricultura de precisão permitem o acompanhamento das áreas agrícolas produtoras de soja, estabelecendo as relações de dependência espacial entre os pontos amostrados. A modelagem da estrutura de variabilidade espacial possibilita a construção de mapas temáticos dos atributos estudados, utilizando como método de interpolação a krigagem. Porém, a presença de valores atípicos entre os elementos amostrais pode influenciar na construção e interpretação desses mapas. A distribuição de probabilidades t-Student tem sido utilizada na tentativa de diminuir a influência dos valores atípicos durante a estimativa dos parâmetros de dependência espacial, por ter caudas mais pesadas que a distribuição normal. A detecção dos valores influentes na área em estudo, por meio da análise de diagnósticos de influência local, confere maior confiabilidade na utilização dos mapas gerados, corroborando a aplicação de insumos. Deste modo, o objetivo deste trabalho foi aplicar as técnicas de influência local em dados espacialmente referenciados, com os modelos de perturbação aditiva e utilizando a matriz escala, considerando a distribuição t-Student n-variada. Foi utilizado um modelo espacial linear para o estudo de dados da produtividade da soja em função da altura média de plantas e do número médio de vagens por planta. As técnicas de influência local foram eficientes para detectar pontos que influenciam na escolha do modelo geoestatístico, nas estimativas dos parâmetros e na construção do mapa temático.

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Loschi, Rosangela H., Pilar L. Iglesias, and Reinaldo B. Arellano-Valle. "Predictivistic characterizations of multivariate student-t models." Journal of Multivariate Analysis 85, no. 1 (April 2003): 10–23. http://dx.doi.org/10.1016/s0047-259x(02)00034-9.

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Nguyen, Hang T., and Ian T. Nabney. "Variational inference for Student-t MLP models." Neurocomputing 73, no. 16-18 (October 2010): 2989–97. http://dx.doi.org/10.1016/j.neucom.2010.07.009.

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Valencia Salazar, Edilberto, Segundo Edilberto Vergara Medrano, Luis Carbajal García, and Manuel Jesús Sánchez Chero. "Aplicación del modelo 4MAT y su influencia en el rendimiento académico de cinemática en estudiantes universitarios." Revista Científica UNTRM: Ciencias Sociales y Humanidades 2, no. 2 (February 17, 2020): 55. http://dx.doi.org/10.25127/rcsh.20192.530.

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Se presentan resultados de la aplicación del Modelo 4MAT en el marco del estudio sobre estilos de aprendizaje y desempeño en la enseñanza de Cinemática del curso de Cinemática de Ingeniería Agroindustrial de la Universidad Nacional Intercultural de la Amazonía. Para lograrlo, se elaboró estrategias de enseñanza aprendizaje basados en los ocho pasos del Modelo 4MAT. Esta experiencia estuvo basada en el enfoque cuantitativo, de tipo aplicativa con diseño cuasi experimental. La muestra consistió de 36 estudiantes (18 del Grupo Experimental y 18 del Grupo Control) de una población de 250. El análisis de resultados se realizó con pruebas, T de Student y Wilcoxon. Se demostró que la aplicación del Modelo 4MAT influye significativamente en el rendimiento académico de estudiantes del ciclo II de la Universidad, aseveración que se sustenta en el análisis estadístico de T de Student, los estudiantes del grupo experimental obtuvieron mejores notas (Promedio 10,44) después del experimento respecto a los del grupo control (Promedio = 5,89); por lado, la significancia estadística p = 0, 00 < 0,05 = α además (t = 1, c 154 < t = 1, 74), significó aceptar la hipótesis de investigación. La aplicación del Modelo 4MAT influye también t significativamente en cuanto al cambio actitudinal positivo en los estudiantes.

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Basso-Aránguiz, Matilde, Mario Bravo-Molina, Antonella Castro-Riquelme, and César Moraga-Contreras. "Propuesta de modelo tecnológico para Flipped Classroom (T-FliC) en educación superior." Revista Electrónica Educare 22, no. 2 (February 15, 2018): 1. http://dx.doi.org/10.15359/ree.22-2.2.

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The Technology Model, called T-FliC is proposed for Flipped Classroom. The aim is to provide IT facilities to the aforementioned pedagogical model. This proposal may be implemented at different levels of higher education. T-FliC is primarily based on the use of free technology resources, especially Google applications such as Classroom, Drive, and YouTube, because they are widely used by students and teachers. This extensive use permits to replicate this model in different educational contexts. The T-FliC model incorporates five ICT phases, ranging from the planning of teaching-learning activities to continuous learning assessments. The implementation of the T-FliC Model includes the following phases: a digital class (learning outside the classroom) with asynchronous guidance of a virtual tutor; a workshop involving dynamic activities for collaborative work (classroom learning) guided by a tutor in person; and an ongoing technological tools evaluation process (clickers, portfolio, and forum) which will generate the digital records of the student learning path. This article includes a bibliographic review of the role of ICT in the education processes and the fundamentals of the Flipped Classroom (FC) methodology. In the paper are included FC implementation experiences in higher education, followed by the presentation of the T-FliC Model as a technological proposal for this methodology. Finally, the conclusions present reflections on the proposal.

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Pamplona, Edgar, Clóvis Fiirst, Nelson Hein, and Vinícius Costa da Silva Zonatto. "Desempenho do Modelo Arma na Previsão das Receitas Orçamentárias dos Municípios do Estado do Paraná." Administração Pública e Gestão Social 11, no. 1 (January 1, 2019): 92–103. http://dx.doi.org/10.21118/apgs.v11i1.1487.

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O estudo investiga o desempenho do modelo ARMA na previsão das receitas orçamentárias dos municípios do Estado do Paraná, em comparação com o modelo proposto pela Secretaria do Orçamento Federal. Pesquisa descritiva, com abordagem quantitativa e análise documental, foi realizada com amostra de 120 municípios. Os achados apontam que o modelo ARMA, no geral, apresentou melhor desempenho na previsão das receitas públicas, com erro médio de 7,05%. Das 120 observações realizadas, o modelo ARMA obteve desempenho superior em 74 casos (61,67%), enquanto que o modelo SOF foi melhor em 46 oportunidades (38,33%). Os erros médios dos dois modelos testados na pesquisa foram submetidos ao teste de diferença de médias (teste t de student), constatando-se que as previsões de ambos os modelos são diferentes estatisticamente ao nível de significância de 5%. Assim, pode-se concluir que o modelo ARMA apresentou melhor qualidade nas previsões das receitas em comparação ao modelo SOF.

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Serrano Bautista, Ramona, and José Antonio Núñez Mora. "Valor en Riesgo en el sector petrolero: un análisis de la eficiencia en la medición del riesgo de la distribución α-estable versus las distribuciones t-Student generalizada asimétrica y normal." Contaduría y Administración 65, no. 2 (January 9, 2019): 173. http://dx.doi.org/10.22201/fca.24488410e.2019.2021.

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En el sector petrolero, el VaR se ha implementado con el objetivo de cuantificar lo mejor posible los movimientos extremos de los precios del petróleo, debido a que estos repercuten la actividad económica y afectan significativamente los movimientos en el mercado accionario (Sadorsky, 1999). Con este propósito, en esta investigación cuantificamos el VaR considerando tres tipos de petróleo (Brent, WTI y MME) y analizamos el desempeño de la estimación del VaR a un día mediante el estadístico de Kupiec considerando modelos GARCH con tres distribuciones alternativas en el proceso de innovación: estable, t-Student generalizada asimétrica y normal en un período de alta volatilidad. Los resultados de la evaluación de desempeño del modelo basado en el estadístico de Kupiec señalan que el modelo VaR-estable es un modelo más robusto y preciso para ambos niveles de confianza que los basados en las distribuciónes t-Student generalizada asimétrica y normal. Este resultado es crucial en el sector financiero, debido a que impacta directamente en la previsión de reservas necesarias para afrontar potenciales pérdidas.

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Fernandez, C. "Multivariate Student-t regression models: Pitfalls and inference." Biometrika 86, no. 1 (March 1, 1999): 153–67. http://dx.doi.org/10.1093/biomet/86.1.153.

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Amador-Salinas, José Gonzalo, Virginia González Rivera, Jesús Estrada Salas, Michelle Vanessa Islas León, Sandra Ramírez Castelán, and Joselyn Rojas Villavicencio. "Evaluación del impacto del seminario análisis conductual aplicado usando el modelo de Kirkpatrick." Revista Digital Internacional de Psicología y Ciencia Social 6, no. 1 (January 31, 2020): 208–26. http://dx.doi.org/10.22402/j.rdipycs.unam.6.1.2020.210.208-226.

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l objetivo de este trabajo fue evaluar el impacto del seminario Análisis Conductual Aplicado ACA, (impartido en modalidad b-learning), en la práctica profesional de los participantes, usando como herramienta, el modelo de Kirkpatrik. Participaron en el estudio un total de 50 egresados del seminario (60% mujeres y 40% hombres) con una media de edad de 31.8 años, de las generaciones 2008 a la 2018; los egresados recibieron la dirección electrónica del cuestionario desarrollado en Google Drive. Los resultados indican que en la evaluación del aprendizaje se obtuvo un promedio de 8.96 (DS= .88), en la evaluación de la satisfacción, se obtuvo un promedio de 9.0372, en la evaluación de la transferencia del conocimiento 8.6175 y en la evaluación del impacto de los conocimientos 8.78. Al comparar el promedio de calificaciones de los egresados del seminario con otros promedios por medio de la prueba estadística t de Student para una muestra, se obtuvo diferencias significativas (8.96>8.3>8; p=0.000). También la satisfacción con los docentes obtuvo diferencias significativas usando la prueba estadística t de Student para una muestra (9.32>8.75; p=0.000). Y finalmente, la evaluación general del seminario también obtuvo diferencias significativas al compararla con otros promedios con la prueba estadística t de Student para una muestra (8.8803>8.52 p=0.000). Se concluye que el seminario propicia la superación académica de los egresados tanto en la aplicación de los conocimientos adquiridos en el curso, como en el mejoramiento de sus actividades profesionales, por medio de modelos de enseñanza mixtos y con profesores capacitados en las TIC. Palabras clave: Seminario, evaluación, satisfacción, transferencia, impacto, TIC

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Oliveira, M. M., F. F. Cardoso, and J. C. S. Osório. "Inferência robusta e heterocedástica em componentes de variância, parâmetros e valores genéticos multirraciais." Revista Brasileira de Zootecnia 40, no. 4 (April 2011): 772–80. http://dx.doi.org/10.1590/s1516-35982011000400010.

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Os objetivos neste estudo foram avaliar um modelo animal multirracial (MAMR) heterocedástico para estimar a heterogeneidade de variância residual devida à raça, à heterozigosidade, ao sexo e ao grupo de contemporâneos (GC) e a robustez a dados extremos. Foram avaliadas diferenças nas estimativas de componentes de variância, herdabilidades e valores genéticos. Foram utilizados 4.016 registros de ganho de peso pós-desmame (GPD) do rebanho de formação da raça Brangus-Ibagé da Embrapa Pecuária Sul. Os dados foram analisados por um MAMR com quatro especificações diferentes da distribuição dos resíduos, definidas pela natureza da variância residual homocedástica (HO) ou heterocedástica (HE) e pela distribuição marginal dos resíduos Gaussiana (G) ou t de Student (T). O melhor ajuste aos dados foi pelo MAMR-T-HE e foi observada heterocedasticidade devida ao sexo e à heterozigosidade dos animais e entre grupos de contemporâneos. Houve diferenças substanciais nas variâncias genéticas de grupos raciais estimadas utilizando-se diferentes modelos e nos heterocedásticos, MAMR-G-HE e MAMR-T-HE. As maiores diferenças nas estimativas de herdabilidade ocorreram entre grupos raciais diferentes. Também foram observados reordenamentos na classificação de animais superiores quanto ao mérito genético quando variâncias residuais heterogêneas e robustez a dados extremos foram consideradas. Avaliações genéticas multirraciais utilizando o modelo t de Student para descrever resíduos e assumindo variâncias residuais heterogêneas são mais apropriadas para realizar interferência no mérito genético de animais produtos de cruzamento entre as raças Angus e Nelore.

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Rosa, João A. da, José Maria S. Barata, Jair Lício F. Santos, and Mario Cilense. "Morfologia de ovos de Triatoma circummaculata e Triatoma rubrovaria (Hemiptera, Reduviidae)." Revista de Saúde Pública 34, no. 5 (October 2000): 538–42. http://dx.doi.org/10.1590/s0034-89102000000500015.

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OBJETIVO: Estudar morfologicamente ovos de T. circummaculata e T. rubrovaria. MÉTODOS: Quarenta ovos das duas espécies foram mensurados por meio de projetor de perfil Nikon modelo 6C, e utilizado o teste Student, para execução da análise estatística. As observações morfológicas foram feitas em microscópio eletrônico de varredura JEOL, modelo JSM-T330A. RESULTADOS/CONCLUSÕES: A análise estatística revelou que os ovos e as cascas de ovos de T. rubrovaria são significativamente maiores que os de T. circummaculata. Observações microscópicas mostraram que a borda corial, assim como a goteira espermática, são bem mais evidentes nos ovos de T. rubrovaria que nos de T. circummaculata. O exocório das duas espécies é formado por áreas poligonais, que são hexagonais em sua maioria. Foram observados também o momento da eclosão do embrião e os detalhes das exúvias embrionárias.

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Vasconcellos, Klaus L. P., and Gauss M. Cordeiro. "Bias corrected estimates in multivariate student t regression models." Communications in Statistics - Theory and Methods 29, no. 4 (January 2000): 797–822. http://dx.doi.org/10.1080/03610920008832516.

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Hernandez-Velasco, Lina L., Carlos A. Abanto-Valle, and Dipak K. Dey. "Mixed effects state-space models with Student-t errors." Journal of Statistical Computation and Simulation 90, no. 17 (July 29, 2020): 3157–74. http://dx.doi.org/10.1080/00949655.2020.1797737.

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Zhao, Weihua, and Riquan Zhang. "Variable selection of varying dispersion student-t regression models." Journal of Systems Science and Complexity 28, no. 4 (November 28, 2014): 961–77. http://dx.doi.org/10.1007/s11424-014-2223-9.

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Barbosa Camargo, Maria Ines, Alejandra Salazar Sarmiento, and Kelly Jhohana Peñaloza Gómez. "Valoración de riesgo mediante modelos GARCH y simulación Montecarlo: evidencia del mercado accionario colombiano." Semestre Económico 22, no. 53 (October 1, 2019): 53–75. http://dx.doi.org/10.22395/seec.v22n53a3.

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Este documento evalúa el comportamiento de varios modelos de volatilidad en estimaciones de un día del valor en riesgo (VaR) de veinticuatro series de retornos de acciones en Colombia con diferentes distribuciones. Al considerar que todas las series de retornos presentan clúster de volatilidad y memoria de largo plazo, se utilizan modelos tipo GARCH que incluyen diferentes distribuciones: normal, T-Student y GED. Los hallazgos corroboran la dificultad de elegir un único modelo para el cálculo del VaR, pero validan el uso de modelos paramétricos con distribución normal y simulación Montecarlo en mercados financieros emergentes.

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Espinosa Acuña, Oscar Andrés, and Paola Andrea Vaca González. "Fitting the classical and bayesian garch models with student-t innovations to the COLCAP index." Revista de Economía del Caribe, no. 19 (January 15, 2017): 34–63. http://dx.doi.org/10.14482/ecoca.19.8343.

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Mar'i, Husnul, Ristiono Ristiono, Yosi Laila Rahmi, and Yuni Ahda. "Effect of Biology Module with Scientific Approach Equipped with a Glossary in discovery learning models Against Learning Competencies of Class X Students of SMAN 1 Pariaman." Jurnal Atrium Pendidikan Biologi 5, no. 4 (September 29, 2020): 31. http://dx.doi.org/10.24036/apb.v5i4.6264.

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The low learning competencies of students is caused by several problems encountered during the teaching and learning process, including the problems that the first textbook used has not involved students actively playing a role in the learning process, learning is still monotonous and the student notebook is incomplete. One of the efforts that is done to increase students’ learning competencies is to apply a biological module with a scientific approach equipped with a glossary in discovery learning models. This research used a Randomized Control Group Posttest Only Design. The population is all student of class 1 SMAN 1 Pariaman. Sampel was taken by using purposive sampling technique. The control class uses textbooks with learning models Discovery learning and experimental classes use biological modules with discovery learning models. Instrument The research instrument used was in the form of a learning competency test, an assessment of attitudes and skills in the form of an observation sheet. The t-test results revealed that knowledge competencies t count > t table (7.06> 1.7), t test results 'competency skills t count < t table ( 0,925< 1.7), and t test results' competency attitude t count < t table (0,76< 1.7). This shows that the hypothesis is accepted in the aspect of knowledge that is not followed by aspects of skills and attitudes. So, it can be concluded that the biological module with a scientific approach equipped with a glossary in the discovery learning model that has significance for learning competencies in the aspects of student knowledgeThe low learning competencies of students is caused by several problems encountered during the teaching and learning process, including the problems that the first textbook used has not involved students actively playing a role in the learning process, learning is still monotonous and the student notebook is incomplete. One of the efforts that is done to increase students’ learning competencies is to apply a biological module with a scientific approach equipped with a glossary in discovery learning models. This research used a Randomized Control Group Posttest Only Design. The population is all student of class 1 SMAN 1 Pariaman. Sampel was taken by using purposive sampling technique. The control class uses textbooks with learning models Discovery learning and experimental classes use biological modules with discovery learning models. Instrument The research instrument used was in the form of a learning competency test, an assessment of attitudes and skills in the form of an observation sheet. The t-test results revealed that knowledge competencies t count > t table (7.06> 1.7), t test results 'competency skills t count < t table ( 0,925< 1.7), and t test results' competency attitude t count < t table (0,76< 1.7). This shows that the hypothesis is accepted in the aspect of knowledge that is not followed by aspects of skills and attitudes. So, it can be concluded that the biological module with a scientific approach equipped with a glossary in the discovery learning model that has significance for learning competencies in the aspects of student knowledge.

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Vasconcellos, Leonardo de Souza, Kelly Renata Sabino, and Andy Petroianu. "Relação entre ooforectomia e peso em modelo experimental." Revista do Colégio Brasileiro de Cirurgiões 32, no. 3 (June 2005): 132–35. http://dx.doi.org/10.1590/s0100-69912005000300006.

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OBJETIVO: Avaliar a influência da privação dos hormônios ovarianos no ganho ponderal, em modelo experimental. MÉTODO: Foram utilizadas 40 ratas fêmeas adultas, distribuídas aleatoriamente em três grupos: Grupo 1 (n=10) - controle, Grupo 2 (n=10) - submetido apenas à laparotomia, Grupo 3 (n=20) - submetido à ooforectomia total bilateral. Os animais foram pesados semanalmente durante 30 semanas e os resultados foram avaliados pelo teste t de Student, com significância para p < 0,05. RESULTADOS: As ratas ooforectomizadas apresentaram ganho ponderal maior do que as demais, sendo a diferença significativa a partir da 9ª semana e persistindo até o fim do experimento. CONCLUSÕES: No presente trabalho, a privação dos hormônios ovarianos foi um fator relacionado com o maior ganho ponderal, em ratas.

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Chavarria-Pallarco, Norman A. "Modelo Van Hiele y niveles de razonamiento geométrico de triángulos en estudiantes de Huancavelica." Investigación Valdizana 14, no. 2 (April 29, 2020): 85–95. http://dx.doi.org/10.33554/riv.14.2.587.

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La investigación tuvo como objetivo determinar si la aplicación del modelo holandés Van Hiele facilita el avance de los niveles de razonamiento geométrico de triángulos en los estudiantes del sexto ciclo de educación básica regular. El tipo de investigación fue aplicada, empleando como métodos específicos: el experimental, el estadístico y el hipotético deductivo; con un diseño preexperimental, con un solo grupo, conformado por 29 estudiantes de la IE “César Vallejo Mendoza” del centro poblado de Viñas, distrito de Acobambilla, provincia y región de Huancavelica a quienes se aplicó una prueba de entrada y otra de salida. El muestreo no probabilístico intencional, el procesamiento y análisis de los resultados se realizó aplicando la estadística, asimismo para la contrastación de las hipótesis se empleó la “t de student”. Como resultado obtuvimos que la aplicación del modelo de Van Hiele facilitó avanzar en el nivel de razonamiento geométrico (visualización, análisis y clasificación), debido a que la “t de student” calculada fue -16, 632 por lo que se rechazó la hipótesis nula, concluyéndose que sí existe una diferencia significativa en las medias de los grados de adquisición del nivel de razonamiento geométrico de triángulos antes y después de la aplicación del modelo Van Hiele.

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Sánchez-Rivas, Enrique, José Sánchez-Rodríguez, and Julio Ruiz-Palmero. "Percepción del alumnado universitario respecto al modelo pedagógico de clase invertida." Magis, Revista Internacional de Investigación en Educación 11, no. 23 (January 1, 2019): 151–68. http://dx.doi.org/10.11144/javeriana.m11-23.paur.

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Este artículo recoge una investigación enfocada a descubrir la percepción del alumnado universitario sobre determinadas ventajas atribuidas al modelo pedagógico de aula invertida. La recogida de datos se realizó a través de un cuestionario aplicado a dos grupos formados por alumnado matriculado en una misma asignatura. El análisis de datos partió del estudio de los estadísticos descriptivos. Para la comparativa entre los grupos se aplicó la prueba t de Student sobre sus puntuaciones medias. Los resultados apuntan a que el alumnado percibe ventajas en el plano didáctico asociadas al modelo pedagógico de aula invertida.

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Bohner, L. O. L., E. Mukai, and P. Tortamano. "Exatidão de Modelos Prototipados para Restaurações Múltiplas de Implantes." Journal of Health Sciences 19, no. 5 (February 23, 2018): 6. http://dx.doi.org/10.17921/2447-8938.2017v19n5p6.

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Comparar a exatidão de modelos de implante prototipados em relação àqueles obtidos pela técnica de moldagem convencional. Um modelo de resina epóxica contendo 3 implantes dentais na região dos dentes 22 (1), 24 (2) e 26 (3) foi utilizado como modelo mestre. Para a técnica convencional (G1), modelos de gesso (n10) foram obtidos a partir da técnica da moldeira aberta. Para a técnica de moldagem digital (G2), corpos de escaneamento foram fixados aos implantes e o modelo mestre foi digitalizado. A confecção dos modelos (n10) foi realizada com base nas imagens virtuais, a partir da prototipagem rápida. Posteriormente, o modelo mestre, os modelos de gesso e modelos prototipados foram digitalizados com um scanner laboratorial. A discrepância média, máxima discrepância positiva e máxima discrepância negativa entre cada modelo e o modelo mestre foram determinadas, assim como a discrepância encontrada em pontos localizados de interesse (cúspide vestibular, cúspide lingual e fossa). Para a análise estatística dos dados, utilizou-se teste T de Student com nível de significância p≤ 0.05. Resultados: Não houve diferença estatisticamente significante entre a discrepância média dos modelos convencionais e prototipados. Os modelos prototipados apresentaram uma maior discrepância na região de cúspides vestibular (G1: 41 ± 28 G2: 117 ± 37 μm) e lingual (G1: 40 ± 19 G2: 80 ± 42 μm). Os modelos convencionais e prototipados apresentaram exatidão comparável. Entretanto, em pontos de interesse a discrepância foi maior para os modelos prototipados.Palavras-chave: Técnicas de Moldagem Odontológica. Próteses e Implantes. Implantes Dentários. CAD-CAM

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Burgess-Hull, Albert J. "Finite Mixture Models with Student t Distributions: an Applied Example." Prevention Science 21, no. 6 (April 18, 2020): 872–83. http://dx.doi.org/10.1007/s11121-020-01109-3.

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Cano Molano, Luz Marina, Sandra Isabel Enciso Galindo, Jaime Andrés Gutiérrez Quintero, and Martha Osorio de Sarmiento. "La modelización en morfología y biología celular en el proceso de enseñanza-aprendizaje en las ciencias básicas en la formación médica / Modeling in morphology and cellular biology as a teaching-learning activity in basic sciences in the medical formation." REVISTA CIÊNCIAS EM SAÚDE 7, no. 3 (September 13, 2017): 8–13. http://dx.doi.org/10.21876/rcsfmit.v7i3.677.

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RESUMENIntroducción: Los procesos de enseñanza aprendizaje de las ciencias básicas tienen diferentes estrategias didácticas que permiten el desarrollo de las competencias de las asignaturas para la formación médica. Con el estudio teórico toda la tarea recae sobre la memoria y la imaginación, al contrario de lo que sucede si el trabajo se realiza de forma activa y las diferentes actividades realizadas requieren de todas las habilidades y sentidos. Objetivos: Evaluar el desempeño académico del estudiante cuando construye y sustenta un modelo tridimensional en las áreas de Biología Celular y Morfofisiología correlacionándolo con el examen oral. Métodos: Se realizó una encuesta de percepción estudiantil y se comparó con un t-student que permitió evaluar el impacto de la modelización en el rendimiento académico de los estudiantes. Resultados: La mediana del modelo fue de 3.38 y la mediana del examen oral fue de 3.75; existiendo una correlación del 84% entre la nota del modelo y el examen oral, con un coeficiente correlación de Pearson 0.85 con una p=0.000, estadísticamente significativa. Conclusión: La actividad académica de construcción de modelos tridimensionales en las áreas de Biología Celular y Morfofisiología para el desarrollo de la compresión de estructuras complejas mejora la capacidad de integración y argumentación de los contenidos de estas asignaturas.Palabras-Clave: Modelización; Ciencias básicas; Proceso enseñanza-aprendizajeABSTRACTIntroduction: The learning processes of the basic sciences have different teaching strategies that allow the development of the competences of the subjects for the training of practioners. With the theoreti-cal study, the whole task falls on memory and imagination, unlike what happens if the work is done in an active way and the different activities performed require all the skills and senses. Aims: To evaluate the student's academic performance when constructing and sustaining a three-dimensional model in the areas of Cell Biology and Morphology and correlate these with the oral exam. Methods: A student perception survey was conducted and compared with the one of a T-student that allowed the evaluation of the impact of the modelling on students' academic per-formance. Results: The average of the model was 3.38 and the average of the oral test was 3.75. There was a correlation of 84% between the model note and the oral test, with a correlation coefficient of Pear-son of 0.85 with a statistical significance p=0.000. Conclusion: The academic activi-ty of construction of three-dimensional models in the areas of Cellular Biology and Morphology for the development of the compression of complex structures im-proves the capacity of integration and argumentation of the contents of these subjects.Keywords: Modeling; Basic sciences; Teaching-learning process

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., Pramiftasari, Andita Nella, Rusijono ., and Harmanto . "Effect of Problem Based Learnig Model on Students Activity and Analytical Skills in Social Studies Project." Volume 5 - 2020, Issue 8 - August 5, no. 8 (August 26, 2020): 521–31. http://dx.doi.org/10.38124/ijisrt20aug274.

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This study aims to examine the effect of problem-based learning models on the activities of fourth grade elementary school students and analyze the effect of problem-based learning models on the analytical skills of fourth grade elementary school students. Implementation of problem-based learning models requires students to actively work together and analyze the problems being studied so that theoretically the application of this model affects the activities and ability of student analysis. This research is an experimental research design with pretest posttest control group design. The subjects of this study were fourth grade students at SDN Tawangsari 1 Sidoarjo. Data collection techniques through observation of student activity sheets and tests of student analysis skills. The analysis technique used is the t test. In this case the t test was carried out twice, first, to find out the initial conditions of the experimental group and the control group and second to find out the conditions after being treated. The results of the t test activity analysis and the students' analytical skills between the control class and the experimental class before being treated showed no significant difference (tcount 1.222 < ttable 2.011 and sig. 2 tailed value 0.233 > 0.05 student activity; tcount 0.164 < ttable 2.011 and the value of sig.2 tailed 0.871 > 0.05 analytical skills). While the results of the t test after being treated showed that there were significant differences between the experimental group and the control group (tcount 3.689 > ttable 2.011 and sig value 2 tailed 0.001 < 0.05 student activity; tcount 2.558 > ttable 2.011 and sig. 2 tailed value 0.015 < 0.05 analytical skills). In this study, treatment is the only differentiator between the experimental group and the control group, so it can be concluded that there is an effect of the application of problem-based learning models to the students' activity and analytical skills. For teachers who face the problem of low activity and analytical skills students are advised to use problem-based learning models.

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Wulansari, Ni Kadek Ayu Mita, and Ni Ketut Suarni. "Animation in Science Learning with Brain Based Learning Models to Improve Student Learning Outcomes." International Journal of Elementary Education 4, no. 2 (July 12, 2020): 160. http://dx.doi.org/10.23887/ijee.v4i2.25244.

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The problems of this study are: the lack of maximum mastery of educators on innovative learning models and media, students are burdened with a lot of material without any pause to give the brain time to process the material provided, learning is less effective and well thought out, discussed useful and active students in the learning process, learning that takes place in the class that is less influential on student learning outcomes. The brain-based learning model of animation-assisted learning of science learning outcomes. This research is a quasi-experimental study, with the design of Nonequivalent Control Group Design. The population of this research is all of the fifth-grade elementary school with 129 students. The method of collecting data in this study is a test method in the form of a multiple-choice test that has been validated. Data were analyzed using a t-test. The results of data analysis obtained t-count = 9.66 at a significance level of 5% and db = 68 obtained t-table = 2.00 so t-count = 9.66> t-table = 2.00. Thus, it can be concluded that there is an influence of an animation-based brain-based learning model on science learning outcomes. Animated brain-based learning model can be applied to science lessons in elementary school as an effort to improve student learning outcomes optimally in science learning

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Effendi, Effendi, and Dwi Pantriani. "Penerapan Model Pembelajaran Generatif Pada Materi Usaha dan Pesawat Sederhana Kelas VIII MTs Nurussalam Sidogede OKU Timur." Physics Education Research Journal 2, no. 1 (February 29, 2020): 59. http://dx.doi.org/10.21580/perj.2020.2.1.4906.

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The purpose of this study was to determine the effect of the application of Generative learning models on student learning outcomes in the Work and Simple Machine in MTs Nurussalam Sidogede grade VIII. The type of this research is a quantitative research. The population in this research were students of class VIII at MTS Nurussalam Sidogede consisting of 4 classes. Sampling in this study was randomly drawn. The experimental class uses the generative learning model, while the control class uses the conventional learning model. Data collection techniques using tests, and testing of hypotheses using t-test. Based on student learning outcomes obtained tcount = 3.09 which is more than ttable = 2.01; so it can be concluded that there are significant differences in learning outcomes between students with generative learning models and students with conventional learning models.

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Mahdavi-Jafari, Z. "Efecto de la pasión por la actividad física sobre el agotamiento (físico) en estudiantes atletas." SPORT TK-Revista EuroAmericana de Ciencias del Deporte 8, no. 2 (July 28, 2019): 125–40. http://dx.doi.org/10.6018/sportk.391851.

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El objetivo general de este estudio fue investigar el efecto de la pasión por la actividad física en el agotamiento (físico) en estudiantes atletas. El presente estudio fue de tipo de encuesta descriptiva y se basó en modelos de ecuaciones estructurales. La población estadística de esta investigación fue de 350 estudiantes de educación física de cuatro universidades estatales de Teherán. Se seleccionaron de forma aleatoria por grupos y se completaron cuestionarios sobre la pasión y el agotamiento, de los cuales se pudieron utilizar 324 cuestionarios. Los resultados indicaron que la pasión obsesiva con un coeficiente de regresión de 0.23 y un estadístico T de 1.32 no tuvo un efecto significativo en el agotamiento de los estudiantes atletas. Sin embargo, la pasión consistente con un coeficiente de regresión de (-0.66) y un estadístico T de (-2.99) tuvo un efecto negativo significativo en el agotamiento de los estudiantes atletas. Además, el modelo de investigación se ajustó adecuadamente. Por lo tanto, se recomienda que los administradores y ejecutivos universitarios implementen y aceleren la planificación e implementación de acciones para informar a los estudiantes y controlar las consecuencias negativas de estas estructuras. The general aim of this study was to investigate the effect of passion for physical activity on (physical) burnout in student athletes. The present study was of descriptive survey kind and based on structural equation modeling. The statistical population of this research was 350 physical education students from four state universities in Tehran. They were selected in a cluster-random way, and completed questionnaires on passion and burnout, of which 324 questionnaires were usable. The results indicated that obsessive passion with a regression coefficient of 0.23 and a T-statistics of 1.32 did not have a significant effect on the burnout of student athletes. However, the passion consistent with the regression coefficient (-0.66) and the T-statistics (-2.99) have a significant negative effect on the burnout of student athletes. Furthermore, the research model was adequately adjusted. Therefore, it is recommended that university administrators and executives implement and accelerate the planning and implementation of actions to inform students and control the negative consequences of these structures.

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Handayani, Rizky, Usman Sain, and Mukhamad Nurhadi. "PENGARUH MEDIA GOOGLE FORM DALAM MODEL PEMBELAJARAN BERBASIS MASALAH TERHADAP HASIL BELAJAR SISWA MATERI ASAM BASA." Orbital: Jurnal Pendidikan Kimia 5, no. 1 (June 30, 2021): 81–90. http://dx.doi.org/10.19109/ojpk.v5i1.6227.

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The aim of research was found the effect of google form media on problem-based learning models with student learning outcomes of XI at one of the schools in Samarinda in acid-base chapter. Design of research was used is true-experimental design is especially posttest only control design. The population was all students of class XI MIPA which amounted to 105 students. The research subject was taken by cluster random sampling. Data collection techniques in this research are test, documentation, and observation techniques. The test technique was obtained of three time post-test at the end of each meeting were obtained from 20% of each post-test score and 40% of final examination score. The documentation data as previous student learning outcomes was used to determine homogeneous of the sample. The observation data was obtained of direct observation of the implementation of the steps of teacher and student learning. Technical analysis of the data using normality test, F-test, and T-test. The average of experimental class learning outcomes and the control class learning outcomes were 79.86 and 73.21, respectively. The T-test result shown T-count (2.75)> T-table (1.67) with significant 0.05. So it can be concluded that the google form media give effect in problem-based learning models onto student learning outcomes in acid-base chapter.

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Flores Ortega, Ada Luz, and Ernesto J. J. Chura Yupanqui. "Influencia de las capacidades emprendedoras de los productores de quinua orgánica y su sustentabilidad – caso Cabana." Revista Investigaciones Altoandinas - Journal of High Andean Investigation 17, no. 2 (August 30, 2015): 257. http://dx.doi.org/10.18271/ria.2015.123.

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El objeto fue describir las capacidades emprendedoras de los productores de quinua orgánica, y proponer un modelo econométrico para las capacidades emprendedoras y su relación con el ingreso familiar mensual, nivel de educación, tamaño familiar, edad y sexo. Un cuestionario fue aplicado para medir las capacidades emprendedoras y se analizó la sustentabilidad de la producción de quinua orgánica a través de indicadores económicos y sociales. En base a los resultados analizados se ha propuesto un modelo econométrico para las capacidades emprendedoras de los productores de quinua orgánica. Los resultados muestran en primer lugar que las habilidades emprendedoras de los productores de quinua están muy desarrolladas y si continúan reforzándola, serán emprendedores exitosos. Finalmente, se propone un modelo econométrico para analizar las capacidades emprendedoras. Las pruebas de significancia estadística usando α=5% realizadas con la prueba t de student, para β1, β2, β3, β4, β5 y F para R2 tienen una probabilidad de casi cero y menores a 5%, lo cual hace que todas las variables independientes sean significantes. Además, observamos que la t- student fue mayor a 2, por lo que podemos afirmar que las variables son significantes. En ese sentido, el coeficiente de determinación R2= 0.3398, explica que solo el 33.98% de la variación de las Habilidades Emprendedoras se explica mediante NED, TF, EDAD, SEXO y AP. Estadísticamente el valor de Durbin-Watson, según el análisis fue de 2.006, lo cual indica la ausencia de autocorrelacion, por ende podemos afirmar que es viable el modelo econométrico.

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Surbakti, Mariana, and Poltak Panjaitan. "PENINGKATAN KUALITAS PEMBELAJARAN BIOLOGI DENGAN METODE KOOPERATIF DI PRODI PEND. FISIKA FKIP UHN MEDAN." Jurnal Visi Eksakta 1, no. 1 (July 30, 2020): 63–78. http://dx.doi.org/10.51622/eksakta.v1i1.49.

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The purpose of this study was to 1) determine student learning outcomes through the Inquiry learning model on metabolic material, 2) know the learning activities of students who were taught with Inquiry learning models in Biology courses, 3) know the psychomotor attitudes of students who were taught with models cooperative learning on metabolic material. This research is an experimental research This research was conducted on physics study students at T.P. 2018/2019. The learning model used is inquiry model in the experimental class and conventional model in the control class.The results showed that: The results of the average value in the control class were: pretest = 45,517 and posttest = 61,896 The results of the average value in the experimental class are: pretest = 48.333 and post test = 80.833 Obtained data X = 80.83; S = 12.32; L hitung = 0.0937; L table = 0.161;then: L calculate <L table, then posttest data Experiment class is normally distributedFrom the results of the statistical calculation above t arithmetic = and t table = 2.003 so as to obtain the value of -2.003 <<2.003 then H0 is accepted, meaning that the initial ability of students in the experimental class is the same as the initial ability of students in the control class.From the results of the statistical calculation above t arithmetic = and t table = 1.6715 to obtain a value of t> t table ie> 1.6715 then H0 is rejected and Ha is accepted meaning there is a significant influence on the use of cooperative learning models on student learning outcomes. The coefficient of linear regression direction ( b) = 0.85 which is positive. This means that the learning outcomes of experimental class student increase due to the influence of the cooperative learning model used in the teaching and learning process in the class.

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Osorio, Felipe, and Manuel Galea. "Detection of a change-point in student-t linear regression models." Statistical Papers 47, no. 1 (January 2006): 31–48. http://dx.doi.org/10.1007/s00362-005-0271-x.

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Canton, Letícia E. D., Luciana P. C. Guedes, Miguel A. Uribe-Opazo, Rosangela A. B. Assumpção, and Tamara C. Maltauro. "Sampling redesign of soil penetration resistance in spatial t-Student models." Spanish Journal of Agricultural Research 19, no. 1 (March 18, 2021): 0202. http://dx.doi.org/10.5424/sjar/2021191-16949.

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Aim of study: To reduce the sample size in an agricultural area of 167.35 hectares, cultivated with soybean, to analyze the spatial dependence of soil penetration resistance (SPR) with outliers. Area of study: Cascavel, Brazil Material and methods: The reduction of sample size was made by the univariate effective sample size ( ) methodology, assuming that the t-Student model represents the probability distribution of SPR. Main results: The radius and the intensity of spatial dependence have an inverse relationship with the estimated value of the . For the depths of SPR with spatial dependence, the highest estimated value of the reduced the sample size by 40%. From the new sample size, the sampling redesign was performed. The accuracy indexes showed differences between the thematic maps with the original and reduced sampling designs. However, the lowest values of the standard error in the parameters of the spatial dependence structure evidenced that the new sampling design was appropriate. Besides, models of semivariance function were efficiently estimated, which allowed identifying the existence of spatial dependence in all depth of SPR.Research highlights: The sample size was reduced by 40%, allowing for lesser financial investments with data collection and laboratory analysis of soil samples in the next mappings in the agricultural area. The spatial t-Student model was able to reduce the influence of outliers in the spatial dependence structure.

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Kaharuddin, Andi, and Irma Magfirah. "PERBANDINGAN KEEFEKTIFAN MODEL TPS STAD PADA PEMBELAJARAN MATEMATIKA KELAS VI SEKOLAH DASAR NEGERI DI KABUPATEN SOPPENG." Taman Cendekia: Jurnal Pendidikan Ke-SD-an 2, no. 2 (December 20, 2018): 223. http://dx.doi.org/10.30738/tc.v2i2.2952.

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This study aims to describe: (1) the effectiveness of Think Pair Share models in learning, (2) the effectiveness of Student Team Achievement Divisions models in learning, and (3) the comparisonof Think Pair Share and Student Team Achievement Divisions models effectiveness on mathematics learning in the sixth-grade students of public elementary schools in Soppeng Regency. This research is a quasi-experimental research. The population in this study was all sixth-grade students of public elementary schools in Soppeng Regency and the samples were determined by cluster stratified random sampling technique. The data collected comprises student learning outcomes data, students’ activity data in learning, and students’ response data on learning media. Students’ activity data and students’ responses were analyzed using descriptive analysis while students’ learning outcomes data were analyzed using descriptive statistical analysis and inferential statistics. The results of the t-test with a significant level 5 = 0.05 in the major hypothesis (1) the implementation of the effective Think Pair Share models, (2) the application of the Student Team Achievement Divisions model, and the major (3) for (a) student learning outcomes (posttest, gain) (b) students’ activity in learning (c) student response, shows that the application of Think Pair Share models is more effective than Student Team Achievement Divisions in the mathematics learning of the sixth-grade students of Public Elementary Schools in Soppeng District.

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Da Silva, Renildo Medeiros, Fernanda Da Silva Mendes, Deivison Venício Souza, Jaquelyne Rosa Da Silva, and Alana Letícia Pereira De Oliveira. "MODELAGEM DA RELAÇÃO HIPSOMÉTRICA PARA UM POVOAMENTO URBANO DE Swietenia macrophylla King NO MUNICÍPIO DE MARABÁ, PARÁ, BRASIL." Revista Agroecossistemas 11, no. 1 (December 16, 2019): 204. http://dx.doi.org/10.18542/ragros.v11i1.4880.

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As relações hipsométricas têm utilidade na mensuração florestal, pois em várias situações torna-se proeminente a estimativa da altura de uma árvore a partir de funções matemáticas acuradas, diminuindo-se o tempo de execução e os custos de inventários florestais. Este trabalho teve como objetivo ajustar modelos hipsométricos tradicionais e selecionar aquele mais acurado para a predição da altura dos indivíduos de S. macrophylla. Foram selecionados 36 indivíduos de S. macrophylla situados na Praça do Mogno, Marabá, Pará. Foram testados cinco modelos hipsométricos tradicionais, em função da variável diâmetro a 1,30 m do solo (DAP) e suas transformações. Os critérios estatísticos para seleção do melhor modelo foram: i) significância da estatística F-Snedecor da Análise de Variância; ii) coeficiente de determinação ajustado (R²aj); iii) erro padrão da estimativa em porcentagem (Syx%); iv) desvio médio percentual (DMP%); v) análise gráfica de resíduos; vi) significância do teste t-Student dos coeficientes da regressão. O modelo que apresentou mais acurácia na estimativa da altura total foi o Modelo 1 ?H = (DAP) / (-16,6089 + 8,1577. DAP), por ter apresentado os melhores coeficientes (R²aj = 99,95%; Syx% = 0,1840%; DMP% = -0,0010) e excelente comportamento sob análise gráfica residual, sendo, portanto, o modelo indicado.Núcleo de Meio AmbienteUniversidade Federal do ParáRua Augusto Corrêa, 01, GuamáBelém, Pará, Brasilhttps://periodicos.ufpa.br/index.php/agroecossistemas PALAVRAS-CHAVE: Mogno, Modelos hipsométricos tradicionais, Regressão linear.

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Najmi, Hayatun, Yayuk Cicilia, and Rian Vebrianto. "Efektifitas Media Pembelajaran Melalui Model Discovery Learning terhadap Minat dan Hasil Belajar Peserta Didik SDN 193 Pekanbaru." Instructional Development Journal 3, no. 1 (April 20, 2020): 43. http://dx.doi.org/10.24014/idj.v3i1.9524.

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This study aims to determine the effect of the use of science learning media on discovery learning models on the interests and achievements of student learning outcomes in alternative energy materials. This study uses an experimental method, the sample consists of 2 classes, cognitive learning achievement data using tests, affective aspects of learning achievement using a questionnaire, hypothesis testing using the right-hand t-test. The data analysis technique used is the n-gain test and independent sample t-test using SPSS version 16.0. The results showed that students who were taught using science learning media on discovery learning models gave a good influence on students' interest and learning achievement better than students who were taught the lecture method. Students with high learning interest produce better average achievement than students with low learning interest, and there is an increase in student learning achievement using learning media

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Maselkosu, Yuliana A., Dominggus Rumahlatu, and S. I. A. Salmanu. "PENERAPAN MODEL PEMBELAJARAN STAD DENGAN MEDIA TEKA-TEKI SILANG DAN MODEL PEMBELAJARAN DISCOVERY LEARNING KONSEP SISTEM GERAK PADA MANUSIA UNTUK MENINGKATKAN HASIL BELAJAR SISWA KELAS VIII SMP NEGERI 1 AMBON." Biopendix: Jurnal Biologi, Pendidikan dan Terapan 4, no. 2 (May 22, 2019): 70–76. http://dx.doi.org/10.30598/biopendixvol4issue2page70-76.

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Background: The STAD model is to motivate students to support each other and help one another in mastering the abilities taught by the teacher. Crosswords are a game of sharpening the brain where we have to fill in the blank spaces (in the form of white boxes) with the letters that form a word based on the instructions given. Method: Design of experimental research with the type of research used is descriptive comparative. The research subjects were the eighth grade students of Ambon 1 Junior High School, totaling 26 students. The instruments used were initial test and final test questions, observation sheets, student worksheets and group worksheets. Results: Research shows that the application of the STAD Cooperative type learning model with Cross Puzzle media can improve student learning outcomes. On average all aspects of value have increased. Can be seen in the achievement of the estimated student score of 83.46%. Continued hypothesis testing using the t-test with the value of thit> ttab (2.27> 2.01) thus there are differences in the improvement of student learning outcomes using the STAD type cooperative learning model with a crossword puzzle media. Conclusion: There are differences in the application of the STAD learning model with crossword media and discovery learning learning models of motion systems concepts in humans to improve learning outcomes of class VIII students of SMPN 1 Ambon, it is evident that the results of t-test analysis where t count> t table that the STAD model with media crossword puzzles is more effective for improving student learning outcomes than the Discovery Learning model

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Taihuttu, Sisilia Marselina, La Moma, and Magy Gaspersz. "THE DIFFERENCE OF STUDENT LEARNING OUTCOMES TAUGHT BY GEOGEBRA SOFTWARE ASSISSTED DISCOVERY LEARNING MODEL AND PROBLEM SOLVING LEARNING MODEL ON TRANSFORMATION GEOMETRY." Jurnal Pendidikan Matematika (Jupitek) 4, no. 1 (August 11, 2021): 7–13. http://dx.doi.org/10.30598/jupitekvol4iss1pp7-13.

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This research was conducted with the aim of knowing: (1) student learning outcomes using discovery learning learning models assisted by geogebra software; (2) student learning outcomes taught using problem solving learning models; (3) whether there are differences in student learning outcomes who are taught using discovery learning learning models assisted by geogebra software and problem solving learning models on geometry transformation material in class XI MIA SMA Negeri 5 Ambon. The type of this research is experimental research, using the posttest only control group design. The population in this study were all students of class XI MIA SMA Negeri 5 Ambon with a total of 170 students and the sample in this study was selected using purposive sampling, namely class XI MIA4 with a total of 34 students and class XI MIA5 with a total of 34 students, so the number of samples in this study namely 68 students. The instrument used in this study is a test instrument consisting of description questions for the final test. In this study, statistical analysis was used, namely t-test and the final results of the study were: (1) there were differences in student learning outcomes who were taught using discovery learning learning models assisted by geogebra software and problem solving learning models on geometry transformation material. This is shown in the results of the t-test calculation, namely the value of Sig. (2-tailed) = 0.017 < value of =0.05, thus causing H0 to be rejected and H1 to be accepted. rejected

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Martel-Carranza, Christian P., and Nathalie Z. Torero-Solano de Martel. "Modelo de gestión balanced scorecard en la atención al cliente de una institución educativa." Gaceta Científica 7, no. 1 (January 20, 2021): 9–16. http://dx.doi.org/10.46794/gacien.7.1.1055.

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Objetivo. Determinar la eficacia del modelo de gestión balanced scorecard en la mejora la calidad del servicio de atención al cliente en el Instituto de Educación Superior Tecnológico Privado Juan Bosco de Huánuco, 2020. Métodos. El estudio tuvo un enfoque cuantitativo, de tipo aplicado, con diseño experimental en su modalidad cuasiexperimental. La muestra fue no probabilística y estuvo conformada por 90 estudiantes, 45 para el grupo control y 45 para el grupo experimental, a los cuales se les aplicó un cuestionario con 40 ítems que fue aplicado al inicio y al final del trabajo investigativo. Las hipótesis se comprobaron mediante la prueba t de Student. Resultados. Se evidenció que la aplicación del modelo balanced scorecard mejoró significativamente la calidad del servicio de atención al cliente en el Instituto, ya que en la prueba de hipótesis de muestras relacionadas (pre y postest del grupo experimental) la t calculada (tc = 4,51) es mayor que la t tabulada o crítica (tt = 1,68). El p-valor de la diferencia de medias fue 0,000. Conclusiones. El modelo de gestión balanced scorecard mejora significativamente la calidad del servicio de atención al cliente en el Instituto Juan Bosco de Huánuco, ya que los que se sometieron a dicho programa obtuvieron una mejoría en el servicio de atención, en comparación a los que no se sometieron al indicado programa y se mantuvieron en promedio.

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Khotimah, Umi Khusnul, Tri Ariani, and Ovilia Putri Utami Gumay. "Efektivitas Model Pembelajaran Quantum Teaching terhadap Hasil Belajar Fisika Siswa SMA Negeri Jayaloka." Science and Physics Education Journal (SPEJ) 1, no. 2 (June 30, 2018): 103–10. http://dx.doi.org/10.31539/spej.v1i2.255.

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The purpose of this study is to determine whether the model of effective teaching quantum teaching used in physics learning in SMA Negeri Jayaloka academic year 2017/2018. The methoud used is quasi eksperiment or pseudoexpansion. The type of research is quasiexperimental research, with the design used is one group pretest and posttest design. The population in this study is all students of class X SMA Negeri Jayaloka academic year 2017/2018. And as the sample is the class X.I which amounted to32 student consisting of 17 male students and15 famale students taken at random. Data retrieval is done by test and non test technique. The collected data were analyzed using ttest at significant level = 0,05 obtained by t value 4,69 more than t table 1,69. So it can be concluded that student learning outcomes by using the modelof learning Quantum Teaching significant completion. Student learning activites in the learning process in the active category. While student response after following learning in good category. Keywords: Quantum Teaching Learning Model, Learning Outcomes,

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Briones Zúñiga, José Luis. "Evaluación de modelos de volatilidad con memoria larga." Pesquimat 23, no. 2 (December 28, 2020): 1–8. http://dx.doi.org/10.15381/pesquimat.v23i2.19342.

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El objetivo del estudio es comparar los modelos de memoria larga para modelar la volatilidad del tipo de cambio. Para dicho objetivo se utiliza el tipo de cambio nominal sol/dolar cubriendo los periodos desde el 19 de julio de 1999 hasta el 19 de noviembre del 2013. Escencialmente se busca examinar la capacidad de predicción entre los modelos de memoria larga y comportamiento hiperbólico de las autocorrelaciones dadas por FIGARCH, HYGARCH e IGARCH y concluyendo que el modelo FIGARCH(1,0.637,1) utilizando una distribución t-Student posee una mejor capacidad de predicción. La predicción de la volatilidad del tipo de cambio en el caso de Perú, es estructuralmente importante en el cálculo del Valor en riesgo (VaR) y en la administración de riesgos.

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Ariska, Yolanda, Johni Azmi, and Betty Holiwarni. "PENERAPAN MODEL PEMBELAJARAN COOPERATIVE SCRIPT UNTUK MENINGKATKAN PRESTASI BELAJAR PESERTA DIDIK PADA MATERI KESETIMBANGAN ION DAN PH LARUTAN PENYANGGA." Jurnal Pendidikan Kimia Universitas Riau 5, no. 2 (July 23, 2020): 78. http://dx.doi.org/10.33578/jpk-unri.v5i2.7639.

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The purpose of this study was to improve student learning achievement in ion and pH equilibrium material and applied on class XI MIA SMA Negeri 9 Pekanbaru. This research is an experimental research using pretest-posttest. The implementation of this research in Pekanbaru 9 High School with the sample of this study was the XI MIA 2 students who were the experimental class and the XI MIA 3 students were the control class. Where the experimental class is a class that is applied cooperative learning models, while the control class does not apply the learning model. In this study the data used by the t-test data analysis technique. From the data analysis test results obtained t count > t table is 3.74> 1.66, with the meaning that the application of cooperative learning models can improve student achievement on the subject of ion balance and pH of buffer solution in class XI MIA SMA Negeri 9 Pekanbaru.

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Fourniyati, Indang Retno, Murbangun Nuswowati, and Edy Cahyono. "The Effects of Projects Based Chemistry Learning Model, Assisted by Chemsong Video to Students’s Learning Completeness and Creativity." Journal of Innovative Science Education 9, no. 3 (December 7, 2020): 314–20. http://dx.doi.org/10.15294/jise.v9i1.36750.

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This study aims to examine the effect of project-based chemistry learning models on cearning completeness and student creativity through the Chemsong video making project. The research method uses the pretest-posttest control group design while the data analysis uses the parametric statistical test that is N-gain, the independent sample t test and the sample t-test paired test. The sample in this study was obtained by cluster random sampling technique from the population of all students of SMK N 8. The gain normality test showed that the average results of the pretest-posttest clasical learning completeness increased by 0.53 with the criteria being in the experimental class and the control class at 0,31 with moderate criteria. The results of the independent sample t-test showed that there was a significant difference in the classical learning completeness of the experimental and control group students, which was 4.56 greater than t critic 1.98 with a significance level of 5%. In the paired sample t test, the value of sig. (2-tailed) of 0,000 <0.05. Whereas the results of student creativity t-test obtained sig values. (2-tailed) of 0,000 <0.05. So it can be concluded that the application of the chemistry learning model based on the Chemsong video project has an effect on improving student mastery learning and creativity.

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Musthofa, Syamsul, Ketut Prasetyo, and Nugroho Hari Purnomo. "Problem-Based Learning Effects on Students Learning Outcomes in the Themes of The Potential and Utilization of Natural Resources." Indonesian Journal of Social Studies 2, no. 2 (November 4, 2019): 95. http://dx.doi.org/10.26740/ijss.v2n2.p95-101.

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This study aims to determine the effect of problem-based learning models on student learning outcomes. This study is Nonequivalent control group design. The sample in this study was class VII which was determined randomly. The material used is the potential and utilization of natural resources. The data obtained are then tested differently using the independent sample t-test. The results showed that the two research classes experienced positive changes regarding student learning outcomes. In the experimental class the problem-based learning model shows learning outcomes that are better than class controls. Calculation of the independent sample t-test posttest shows that students with Sig. (2-tailed) 0.019, where 0.019 <0.05 means that there is a significant difference. The existence of significant differences indicates that there is an influence of problem-based learning models on student learning outcomes.

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Hasanah, Mauiza. "Perbandingan Hasil Belajar Siswa Konsep Sistem Peredaran Darah Menggunakan Model Two Stay Two Stray (TSTS) dan Think Pair Share (TPS) di SMP Negeri 2 Seunagan Kabupaten Nagan Raya." BIOTIK: Jurnal Ilmiah Biologi Teknologi dan Kependidikan 3, no. 2 (February 1, 2017): 145. http://dx.doi.org/10.22373/biotik.v3i2.1005.

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This study entitled: "Comparison of Student Learning Outcomes in Circulatory System Concepts with using Two Stay Two Stray (TSTS) and Think Pair Share (TPS) Models at SMP Negeri 2 Seunagan Nagan Raya". This study aims to figure out the differences in student learning outcomes in Circulatory System concept by using Two Stay Two Stray (TSTS) and Think Pair Share (TPS) models at SMP N 2 Seunagan Nagan Raya. The data were collected by using Library Research and Field Research. The population of this study were all students of VIII class in SMP Negeri 2 Seunagan Nagan Raya (60 people). The samples were 17 students of class VIII.2 and 17 students of class VIII.3. The technique used in collecting the data was learning outcomes test. The data were analyzed by using t test (t-count). The result showed that t-count was greater than t-table (t-count = 3.059>t- table = 2.037). it can be concluded that Two Stay Two Stray (TSTS) learning model is better than Think Pair Share (TPS) learning model in Circulatory Systems concept at SMP Negeri 2 Seunagan Nagan Raya, with the the average score in VIII.2 class (Two Stay Two Stray model) was 74.41 and the average score in VIII.3 class (Think Pair Share model) was 68.52.

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Ibrahim, Ibrahim, Nurul Akmal, and Marwan Marwan. "Problem-based Learning and Student Critical Thinking to Improve Learning Achievement at Private Universities in Aceh." AL-ISHLAH: Jurnal Pendidikan 13, no. 2 (August 24, 2021): 1142–51. http://dx.doi.org/10.35445/alishlah.v13i2.698.

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This study aimed to determine the effectiveness of problem-based teaching and learning models to increase learning achievement and the relationship with students' critical thinking skills. This study used an experimental method with a design pretest-posttest control group. The population in this study were all semester four students of the Biology Education Department. Analysis of experimental data to measure the achievement of student learning outcomes with t-test and critical thinking skills using percentage description analysis, using statistical computer software programs. The research results show an increase in learning achievement, with an average N-gain for problem-based learning units is 70.9 (moderate) and 57.93 (moderate) for conventional classes. The t-test results show that the t-count value is 3.61 and the t-table is 1.991, so t-count t-table. The conclusion is that there are differences in learning outcomes in implementing problem-based teaching and learning models to increase learning outcomes with critical thinking skills of four at the Private University of Aceh Province, Indonesia.

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Harsanti, Arni Gemilang. "PERBANDINGAN PENERAPAN MODEL PEMBELAJARAN STAD (STUDENT TEAM ACHIEVEMENT DIVISION) DENGAN MODEL PEMBELAJARAN TAI (TEAM ASSISTED INDIVIDUALIZATION) TERHADAP HASIL BELAJAR MATEMATIKA SISWA KELAS V SEKOLAH DASAR NEGERI DI KECAMATAN BALEREJO KABUPATEN MADIUN." Profesi Pendidikan Dasar 1, no. 1 (January 8, 2018): 10. http://dx.doi.org/10.23917/ppd.v1i1.3279.

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This study aims to determine the different of the application of Student Team Achievement Division models and Team Assisted Individualizaton models in mathematic student achievement 0f class V SDN Gading 01 and SDN Kebonagung 02 in 2015/2016 school year. This research design uses quantitative research methods. Collecting data in this study uses test methods. Test methods in this study is post test given to the control group and eksperimental group. Data analysis is used t – test.The result of data analysis t – test obtained value = 5,26. At the significance level 5% with t table =1,701. So that is = 5,26 > . Therefore is rejected and accepted. The conclusion of this study is that different between application of Student Team Achievement Division models and Team Assisted Individualizaton models in mathematic student achievement 0f class V SDN Gading 01 and SDN Kebonagung 02 in 2015/2016 school year.Keywords: Student Team Achievement Division models, Team Assisted Individualizaton models, Learning Achievement.

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Journal articles on the topic 'Modelo t de Student'

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