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Dissertations / Theses on the topic 'ANOVA test'

Author: Grafiati

Published: 6 September 2023

Last updated: 25 July 2025

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1

Liu, Hangcheng. "Comparing Welch's ANOVA, a Kruskal-Wallis test and traditional ANOVA in case of Heterogeneity of Variance." VCU Scholars Compass, 2015. http://scholarscompass.vcu.edu/etd/3985.

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Analysis of variance (ANOVA) is a robust test against the normality assumption, but it may be inappropriate when the assumption of homogeneity of variance has been violated. Welch ANOVA and the Kruskal-Wallis test (a non-parametric method) can be applicable for this case. In this study we compare the three methods in empirical type I error rate and power, when heterogeneity of variance occurs and find out which method is the most suitable with which cases including balanced/unbalanced, small/large sample size, and/or with normal/non-normal distributions.

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2

Ning, Wei. "A new approach to test for interactions in two-way ANOVA models." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2006. http://proquest.umi.com/login?COPT=REJTPTU0NWQmSU5UPTAmVkVSPTI=&clientId=3739.

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3

Patrick, Joshua Daniel. "Simulations to analyze Type I error and power in the ANOVA F test and nonparametric alternatives." [Pensacola, Fla.] : University of West Florida, 2009. http://purl.fcla.edu/fcla/etd/WFE0000158.

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4

Senteney, Michael H. "A Monte Carlo Study to Determine Sample Size for Multiple Comparison Procedures in ANOVA." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou160433478343909.

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5

Opoku-Nsiah, Richard. "A computationally efficient bootstrap-equivalent test for ANOVA in skewed populations with a large number of factor levels." Diss., Kansas State University, 2017. http://hdl.handle.net/2097/38155.

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Doctor of Philosophy<br>Department of Statistics<br>Haiyan Wang<br>Advances in technology easily collect a large amount of data in scientific research such as agricultural screening and micro-array experiments. We are particularly interested in data from one-way and crossed two-way designs that have a large number of treatment combinations but small replications with heteroscedastic variances. In this framework, several test statistics have been proposed in the literature. Even though the form of these proposed test statistics may be different, they all use limiting normal or chi-square distri

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6

Larsson, Stefan. "Mixing Processes for Ground Improvement by Deep Mixing." Doctoral thesis, KTH, Civil and Architectural Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3667.

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<p>The thesis is dealing with mixing processes havingapplication to ground improvement by deep mixing. The mainobjectives of the thesis is to make a contribution to knowledgeof the basic mechanisms in mixing binding agents into soil andimprove the knowledge concerning factors that influence theuniformity of stabilised soil.</p><p>A great part of the work consists of a literature surveywith particular emphasis on literature on the processindustries. This review forms a basis for a profounddescription and discussion of the mixing process and factorsaffecting the process in connection with deep m

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7

Sahlström, Linda. "Att klättra, springa, krypa och kasta : En effektutvärdering inom området rörelseförståelse bland barn: har interventionen ”Rörelsesatsning i skolan” gett någon effekt?" Thesis, Mälardalens högskola, Akademin för hälsa, vård och välfärd, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-45321.

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Övervikt är en av de ledande folkhälsoutmaningarna i världen där cirka en tredjedel av världens befolkning är övervikta eller har fetma vilket medför negativa hälsoeffekter och sjukdomar. Övervikt och fetma drabbar även barn och unga där en kraftig ökning har skett under de senaste 40 åren. Fysisk aktivitet utgör en viktig komponent för att minska fetmaepidemin, dock förekommer även en ökad andel fysiskt inaktiva barn och unga i Sverige. Skolan ses som en bra arena för folkhälsoarbete men det förekommer dock spridd forskning gällande effekterna av interventioner som syftar att öka den fysiska

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8

Giosa, Francesca. "I test d'ipotesi e la loro declinazione in ambito medico." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15992/.

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Una domanda di rilevante interesse in ambito medico e in particolare nell'ambito della ricerca medica è: avendo a disposizione un certo numero di farmaci quale di questi è più efficace? E' chiaro quanto sia importante conoscere l'efficacia di un farmaco prima di somministrarlo e la statistica medica con lo strumento statistico comunemente chiamato Test d'ipotesi si occupa di rispondere a queste domande e di limitare il più possibile gli errori di valutazione che si possono commettere. Lo scopo della mia tesi è spiegare l'utilizzo dei test d'ipotesi e in particolare di analizzare il confronto t

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9

Mu, Zhiqiang. "Comparing the Statistical Tests for Homogeneity of Variances." Digital Commons @ East Tennessee State University, 2006. https://dc.etsu.edu/etd/2212.

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Testing the homogeneity of variances is an important problem in many applications since statistical methods of frequent use, such as ANOVA, assume equal variances for two or more groups of data. However, testing the equality of variances is a difficult problem due to the fact that many of the tests are not robust against non-normality. It is known that the kurtosis of the distribution of the source data can affect the performance of the tests for variance. We review the classical tests and their latest, more robust modifications, some other tests that have recently appeared in the literature,

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10

Laird, Daniel T. "Analysis of Covariance with Linear Regression Error Model on Antenna Control Unit Tracking." International Foundation for Telemetering, 2015. http://hdl.handle.net/10150/596393.

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ITC/USA 2015 Conference Proceedings / The Fifty-First Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2015 / Bally's Hotel & Convention Center, Las Vegas, NV<br>Over the past several years DoD imposed constraints on test deliverables, requiring objective measures of test results, i.e., statistically defensible test and evaluation (SDT&E) methods and results. These constraints force the tester to employ statistical hypotheses, analyses and perhaps modeling to assess test results objectively, i.e., based on statistical metrics, probability of confidence and

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11

Widerberg, Carl. "The Two-Sample t-test and the Influence of Outliers : - A simulation study on how the type I error rate is impacted by outliers of different magnitude." Thesis, Uppsala universitet, Statistiska institutionen, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-375767.

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This study investigates how outliers of different magnitude impact the robustness of the twosample t-test. A simulation study approach is used to analyze the behavior of type I error rates when outliers are added to generated data. Outliers may distort parameter estimates such as the mean and variance and cause misleading test results. Previous research has shown that Welch’s ttest performs better than the traditional Student’s t-test when group variances are unequal. Therefore these two alternative statistics are compared in terms of type I error rates when outliers are added to the samples.

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12

Laird, Daniel T. "Logistics Regression Model on Antenna Control Unit Autotracking Mode." International Foundation for Telemetering, 2015. http://hdl.handle.net/10150/596414.

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ITC/USA 2015 Conference Proceedings / The Fifty-First Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2015 / Bally's Hotel & Convention Center, Las Vegas, NV<br>Over the past several years DoD imposed constraints on test deliverables, requiring objective measures of test results, i.e., statistically defensible test and evaluation (SDT&E) methods and results. These constraints force testers to employ statistical hypotheses, analyses and modeling to assess test results objectively, i.e., based on statistical metrics, analytical methods, probability of confi

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13

Bensmail, Erica. "Studio dei cambiamenti di colore e del contenuto in clorofille e carotenoidi di oli di semi di canapa durante un test di stoccaggio accelerato." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2022.

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Il presente lavoro di tesi mira a valutare i cambiamenti relativi al colore e al contenuto in clorofille e carotenoidi in 7 differenti oli alimentari di semi di canapa spremuti a freddo, sottoposti a un test di stoccaggio accelerato. Questa matrice alimentare è particolarmente incline all’ossidazione, a causa dell’elevato contenuto in acidi grassi polinsaturi, che può determinare un peggioramento della qualità nutrizionale e sensoriale del prodotto. I 7 oli sono stati posti in stufa a 60°C per 18 giorni, ed è stato effettuato per ognuno di questi oli un campionamento al tempo 0 e ogni 3 giorni

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14

Flamigni, Luca. "Analisi del Cammino in Pazienti Affetti da Idrocefalo Normoteso Attraverso IMU Indossabili." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.

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L’idrocefalo normoteso idiopatico (iNPH) è una patologia che si sviluppa in età senile ed è caratterizzata da un insieme di sintomi generici tra cui disturbi della marcia che rendono difficoltosa la diagnosi. La presente attività di tesi mira ad identificare parametri motori specificamente alterati in pazienti affetti da iNPH rispetto a pazienti con sintomatologie simili, che siano quindi un possibile ausilio alla diagnosi differenziale oltre ad essere sensibili all’intervento terapeutico. Trenta pazienti hanno preso parte allo studio (15 idrocefali, 9 misti e 6 con altre patologie) e sono sta

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15

Söderberg, Max Joel, and Axel Meurling. "Feature selection in short-term load forecasting." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-259692.

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This paper investigates correlation between energy consumption 24 hours ahead and features used for predicting energy consumption. The features originate from three categories: weather, time and previous energy. The correlations are calculated using Pearson correlation and mutual information. This resulted in the highest correlated features being those representing previous energy consumption, followed by temperature and month. Two identical feature sets containing all attributes1 were obtained by ranking the features according to correlation. Three feature sets were created manually. The firs

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16

Mankayi, Dolphia Thozama. "An investigation into the relationship between satisfaction with life and sense of coherence amongst the unemployed." University of the Western Cape, 1996. http://hdl.handle.net/11394/7861.

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Magister Commercii (Industrial Psychology) - MCom(IPS)<br>The present study investigated the relationship between the Sense Of Coherence and Satisfaction With Life amongst the unemployed. The study attempted to test the following hypotheses. 1. People with a high Sense Of Coherence tend to be satisfied with their lives in general. 2. Demographic variables such as age, gender, race and level of education have an influence on the subjects' scores on the Sense Of Coherence and Satisfaction With Life scales. 3. Length of unemployment has an impact on the subjects' Sense Of Coherence and Satisfact

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17

Kossaï, Mohamed. "Les Technologies de L’Information et des Communications (TIC), le capital humain, les changements organisationnels et la performance des PME manufacturières." Thesis, Paris 9, 2013. http://www.theses.fr/2013PA090035/document.

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Les TIC sont un facteur clé de performance dans les pays développés. Cette thèse s’intéresse à l’adoption des TIC et leur impact sur la performance des PME manufacturières d’un pays en développement. A la suite d’une première partie qui présente le cadre théorique et conceptuel, le reste de la thèse est organisé en trois études empiriques. La première étude propose une modélisation Probit afin d’identifier les déterminants d’adoption des TIC. Le capital humain est la variable explicative la plus significative. Se basant sur la régression linéaire à variables muettes, la causalité de Granger, l

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18

Rajapaksha, Kosman Watte Gedara Dimuthu Hansana. "WALD TYPE TESTS WITH THE WRONG DISPERSION MATRIX." OpenSIUC, 2021. https://opensiuc.lib.siu.edu/dissertations/1949.

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A Wald type test with the wrong dispersion matrix is used when the dispersion matrix is not a consistent estimator of the asymptotic covariance matrixof the test statistic. One class of such tests occurs when there are k groups and it is assumed that the population covariance matrices from the k groups are equal, but the common covariance matrix assumption does not hold. The pooled t test, one way AVOVA F test, and one way MANOVA F test are examples of this class. Two bootstrap confidence regions are modified to obtain large sample Wald type tests with the wrong dispersion matrix.

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19

Pisinthpunth, C. "A Guideline for Environmental Games (GEG) and a randomized controlled evaluation of a game to increase environmental knowledge related to human population growth." Thesis, Coventry University, 2015. http://curve.coventry.ac.uk/open/items/ab227155-e0c9-4389-a76c-33b9f8283fcf/1.

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People often have very little knowledge about the impact of unsustainable human population growth on the environment and social well-being especially in developing countries. Therefore, an efficient method should be explored in order to educate, and if possible, to convince the members of the public to realize the environmental and social problems caused by the unsustainable population growth. Digital Game-Based Learning (DGBL) has been highlighted by some studies as an innovative tool for learning enhancement. While only a handful of studies have scientifically evaluated the impact of DGBL on

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20

Rasch, Dieter, Thomas Rusch, Marie Simeckova, Klaus D. Kubinger, Karl Moder, and Petr Simecek. "Tests of additivity in mixed and fixed effect two-way ANOVA models with single sub-class numbers." Springer, 2009. http://dx.doi.org/10.1070/s00362-009-0254-4.

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In variety testing as well as in psychological assessment, the situation occurs that in a two-way ANOVA-type model with only one replication per cell, analysis is done under the assumption of no interaction between the two factors. Tests for this situation are known only for fixed factors and normally distributed outcomes. In the following we will present five additivity tests and apply them to fixed and mixed models and to quantitative as well as to Bernoulli distributed data. We consider their performance via simulation studies with respect to the type-I-risk and power. Furthermore, tw

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21

Al-Abdullatif, Fatimah. "Discriminant Function Analysis Versus Univariate ANOVAs as Post Hoc Procedures Following Significant MANOVA Test: A Monte Carlo Study." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1585072063453955.

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22

Sousa, Isaac Diego Pereira de. "Design and testing Of blades for small wind turbines with different geometrical correction in root and tip of blade." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12320.

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CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel Superior<br>The work aims to build , using the BEM (Blade Element Moment) theory , and test three wind rotors , each one consisting of three blades, which were constructed and used for assembling three SWT (Small Wind Turbine) with TSR (Tip Speed Ratio) equal to seven. The three rotors with blades of 2 meters length, distinguished themselves in their geometries as follows: 1) blades without any correction, 2) blades with only tip correction, 3) blades with only root correction. The NREL S809 airfoil developed by the U.S. National Renewable Ener

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23

Havlásek, Radim. "Statistické plánování experimentů pro účely optimalizace kvality." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217910.

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This thesis is aimed to Design of Experiments methodology. Main purpose of this thesis is to create detailed materials for lessons of Design of Experiments in Quality Control courses. Thesis contains case studies which are applicable for education purposes. Design of Experiments has been applied for solder joints quality evaluation. Solder joints have been modeled in software ANSYS and finite element method has been applied for thermomechanical stress evaluation.

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24

Tejkal, Martin. "Vybrané transformace náhodných veličin užívané v klasické lineární regresi." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318798.

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Klasická lineární regrese a z ní odvozené testy hypotéz jsou založeny na předpokladu normálního rozdělení a shodnosti rozptylu závislých proměnných. V případě že jsou předpoklady normality porušeny, obvykle se užívá transformací závisle proměnných. První část této práce se zabývá transformacemi stabilizujícími rozptyl. Značná pozornost je udělena náhodným veličinám s Poissonovým a negativně binomickým rozdělením, pro které jsou studovány zobecněné transformace stabilizující rozptyl obsahující parametry v argumentu navíc. Pro tyto parametry jsou stanoveny jejich optimální hodnoty. Cílem druhé č

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25

Yuan, Hao. "Optimization of Rib-To-Deck Welds for Steel Orthotropic Bridge Decks." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/35935.

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Orthotropic steel deck has been widely used over the decades especially on long-span bridges due to its light weight and fast construction. However fatigue cracking problems on the welds have been observed in many countries. Rib-to-deck welds need special care since they are directly under wheel loads, which cause large local stress variations and stress reversals. <p> Currently the only requirement by AASHTO bridge code is that the rib-to-deck welds need to be fabricated as one-sided partial penetration welds with minimum penetration of 80% into the rib wall thickness. However considering

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26

Lohaka, Hippolyte O. "MAKING A GROUPED-DATA FREQUENCY TABLE: DEVELOPMENT AND EXAMINATION OF THE ITERATION ALGORITHM." Ohio : Ohio University, 2007. http://www.ohiolink.edu/etd/view.cgi?ohiou1194981215.

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27

Carroll, Gretchen Kay. "AN EXAMINATION OF THE RELATIONSHIP BETWEEN PERSONALITY TYPE, SELF PERCEPTION ACCURACY AND TRANSFORMATIONAL LEADERSHIP PRACTICES OF FEMALE HOSPITAL LEADERS." Bowling Green State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1288189512.

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28

Aderibigbe, Aderonke. "Rock-Fluid Chemistry Impacts on Shale Hydraulic Fracture and Microfracture Growth." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-11129.

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The role of surface chemical effects in hydraulic fracturing of shale is studied using the results of unconfined compression tests and Brazilian tests on Mancos shale- cored at depths of 20-60 ft. The rock mineralogy, total organic carbon and cation exchange capacity were determined in order to characterize the shale. Adsorption tests to study the interaction of the shale and aqueous fluid mixture were also carried out using surface tension measurements. The uniaxial compressive strengths and tensile strengths of individual shale samples after four hours exposure to water, 2.85 x 10^-3 M cati

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29

Srivastava, Pooja. "Monitoring and risk assessment of polyaromatic hydocarbons (PAHs) in a stretch of river ganges." Thesis, 2016. http://localhost:8080/iit/handle/2074/7104.

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30

Dacal, Rafael. "The Effects of an Employment Tax Enforcement Regime on US Small Business and Proprietor Payment Compliance." 2017. http://scholarworks.gsu.edu/bus_admin_diss/78.

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This study attempted to identify ways to improve voluntary compliance and minimize taxpayer burden, but also tries to understand the behavior of taxpayers’ compliance given the compliance regimen. Most explicitly, it attempted to identify ways to improve payment compliance using regimens already utilized in other parts of the tax code. The research question was whether different tax regimes, such as safe harbor, can change the behavior of employment tax payment for small business or self-employed taxpayers. The idea was to determine if a safe harbor provision can reduce the proclivity of autho

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31

Wang, YuSheng, and 王昱昇. "Two independent sample T test under the extended ANCOVA model." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/92940893381555898238.

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碩士<br>國立臺北大學<br>統計學系<br>92<br>Many experiments are implemented to see if there is a significant mean difference in outcome between two treatments. Two independent sample T test and the analysis of variance (ANOVA) are two major methods. However, sometimes the outcome may be apparently affected by the covariate. The way to remove the influence from the covariate is so-called the analysis of covariance (ANCOVA). Comparing with the two methods, T and F, the ANCOVA can increase the Power to the test. Neter (1999) used the adjusted covariate term as an independent variable in the regress

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32

Huang, Wei-Hsueh, and 黃為學. "Hierarchical ANOVA and F-Tests for Functional Data with Local Polynomial Fitting." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/699vk2.

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Chaka, Lyson. "Impact of unbalancedness and heteroscedasticity on classic parametric significance tests of two-way fixed-effects ANOVA tests." Diss., 2016. http://hdl.handle.net/10500/23287.

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Classic parametric statistical tests, like the analysis of variance (ANOVA), are powerful tools used for comparing population means. These tests produce accurate results provided the data satisfies underlying assumptions such as homoscedasticity and balancedness, otherwise biased results are obtained. However, these assumptions are rarely satisfied in real-life. Alternative procedures must be explored. This thesis aims at investigating the impact of heteroscedasticity and unbalancedness on effect sizes in two-way fixed-effects ANOVA models. A real-life dataset, from which three different

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Deneke, Tewodros Mesfin. "The influence of service quality on customer satisfaction, customer value and behavioral intentions in the hotel sector of Ethiopia." Thesis, 2015. http://hdl.handle.net/10500/22240.

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The basic purpose of this study was to examine the influence of service quality on customer satisfaction, perceived customer value and behavioral intentions, in three, four and five star hotels in Ethiopia. Additionally, an attempt was made to assess the differences pertaining to these constructs across customer profile (e.g., gender, nationality etc.) and hotel characteristics (e.g., star ratings etc.). A quantitative survey approach was used to obtain primary data from the respondents (hotels’ guests/customers) by administering the structured questionnaire. The original SERVPERF dimensions a

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Dores, Rute Alexandra Silvestre. "Métodos de análise de variância e regressão na avaliação do desenvolvimento da doença periodontal." Master's thesis, 2020. http://hdl.handle.net/10451/48429.

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Tese de mestrado, Matemática Aplicada à Economia e Gestão, Universidade de Lisboa, Faculdade de Ciências, 2020<br>A doença periodontal engloba um grupo de condições inflamatórias determinadas pela destruição progressiva do periodonto. Esta doença afeta a gengiva e os tecidos dentários de suporte, sendo classificada como gengivite, inflamação reversível da gengiva marginal, e periodontite, quando existe destruição de estruturas que suportam o dente. Um dos principais agentes de desencadeamento dessa patologia é a placa bacteriana. Para o sucesso do tratamento da doença periodontal é importante

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