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Dissertations / Theses on the topic 'ARIMA models'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

Örneholm, Filip. "Anomaly Detection in Seasonal ARIMA Models." Thesis, Uppsala universitet, Tillämpad matematik och statistik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-388503.

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2

Isbister, Tim. "Anomaly detection on social media using ARIMA models." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-269189.

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This thesis explores whether it is possible to capture communication patterns from web-forums and detect anomalous user behaviour. Data from individuals on web-forums can be downloaded using web-crawlers, and tools as LIWC can make the data meaningful. If user data can be distinguished from white noise, statistical models such as ARIMA can be parametrized to identify the underlying structure and forecast data. It turned out that if enough data is captured, ARIMA models could suggest underlying patterns, therefore anomalous data can be identified. The anomalous data might suggest a change in th

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3

Koliadenko, Pavlo <1998&gt. "Time series forecasting using hybrid ARIMA and ANN models." Master's Degree Thesis, Università Ca' Foscari Venezia, 2021. http://hdl.handle.net/10579/19992.

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Urettini, Edoardo <1997&gt. "Combination of forecasts from ARIMA, Neural Networks and Hybrid models." Master's Degree Thesis, Università Ca' Foscari Venezia, 2021. http://hdl.handle.net/10579/19877.

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Lo scopo della tesi è mostrare se una combinazione di previsioni di diversi tipi di modelli possa migliorare le capacità predittive rispetto ai modelli presi separatamente. Sono state utilizzate tre diverse classi di modelli: modelli ARIMA-GARCH, reti neurali e una ibridazione tra queste due classi. La combinazione delle previsioni di queste diverse classi cerca di estrarne le capacità uniche nello spiegare una serie storica, andando oltre la generalizzazione fornita da un unico modello ibrido. Viene presentata una applicazione sulla previsione dell'indice VIX.

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Uppling, Hugo, and Adam Eriksson. "Single and multiple step forecasting of solar power production: applying and evaluating potential models." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-384340.

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The aim of this thesis is to apply and evaluate potential forecasting models for solar power production, based on data from a photovoltaic facility in Sala, Sweden. The thesis evaluates single step forecasting models as well as multiple step forecasting models, where the three compared models for single step forecasting are persistence, autoregressive integrated moving average (ARIMA) and ARIMAX. ARIMAX is an ARIMA model that also takes exogenous predictors in consideration. In this thesis the evaluated exogenous predictor is wind speed. The two compared multiple step models are multiple step

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6

Holens, Gordon Anthony. "Forecasting and selling futures using ARIMA models and a neural network." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/mq23343.pdf.

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7

Miquelluti, Daniel Lima. "Métodos alternativos de previsão de safras agrícolas." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/11/11134/tde-06042015-153838/.

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O setor agrícola é, historicamente, um dos pilares da economia brasileira, e apesar de ter sua importância diminuída com o desenvolvimento do setor industrial e de serviços ainda é responsável por dar dinamismo econômico ao país, bem como garantir a segurança alimentar, auxiliar no controle da inflação e na formação de reservas monetárias. Neste contexto as safras agrícolas exercem grande influência no comportamento do setor e equilíbrio no mercado agrícola. Foram desenvolvidas diversas metodologias de previsão de safra, sendo em sua maioria modelos de simulação de crescimento. Entretanto, rec

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SILVA, Areli Mesquita da. "Estudo de modelos ARIMA com variáveis angulares para utilização na perfuração de poços petrolíferos." Universidade Federal de Campina Grande, 2007. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1184.

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Submitted by Johnny Rodrigues (johnnyrodrigues@ufcg.edu.br) on 2018-07-16T19:54:29Z No. of bitstreams: 1 ARELI MESQUITA DA SILVA - DISSERTAÇÃO PPGMAT 2007..pdf: 701919 bytes, checksum: 78ea7b65513f1fe6d83acdb4f3030b43 (MD5)<br>Made available in DSpace on 2018-07-16T19:54:29Z (GMT). No. of bitstreams: 1 ARELI MESQUITA DA SILVA - DISSERTAÇÃO PPGMAT 2007..pdf: 701919 bytes, checksum: 78ea7b65513f1fe6d83acdb4f3030b43 (MD5) Previous issue date: 2007-07<br>Séries temporais envolvendo dados angulares aparecem nas mais diversas áreas do conhecimento. Por exemplo, na perfuração de um poço petrolífer

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9

Palandi, Victor Camillo. "Análise e projeção do ecommerce em Portugal." Master's thesis, Instituto Superior de Economia e Gestão, 2021. http://hdl.handle.net/10400.5/22752.

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Mestrado Bolonha em Métodos Quantitativos para a Decisão Económica e Empresarial<br>O consumo online é pauta relevante na sociedade desde o início dos anos 2000. Potencializado pela pandemia global, a importância estratégica deste canal para todos os agentes de mercado é indiscutível. O projeto de pesquisa tem como objetivo apresentar a realidade e evolução do e-commerce em Portugal, a partir da análise de um painel de domicílios, bem como prever a evolução de vendas do canal em 2021. São aplicadas metodologias de alisamento exponencial e modelos de previsão ARIMA de Box-Jenkins a uma base de

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Campos, Celso Vilela Chaves. "Previsão da arrecadação de receitas federais: aplicações de modelos de séries temporais para o estado de São Paulo." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/96/96131/tde-12052009-150243/.

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O objetivo principal do presente trabalho é oferecer métodos alternativos de previsão da arrecadação tributária federal, baseados em metodologias de séries temporais, inclusive com a utilização de variáveis explicativas, que reflitam a influência do cenário macroeconômico na arrecadação tributária, com o intuito de melhorar a acurácia da previsão da arrecadação. Para tanto, foram aplicadas as metodologias de modelos dinâmicos univariados, multivariados, quais sejam, Função de Transferência, Auto-regressão Vetorial (VAR), VAR com correção de erro (VEC), Equações Simultâneas, e de modelos Estrut

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Santos, Alan Vasconcelos. "AnÃlise de modelos de sÃries temporais para a previsÃo mensal do imposto de renda." Universidade Federal do CearÃ, 2003. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=1463.

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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico<br>O presente trabalho objetiva realizar previsÃes mensais da sÃrie do imposto de renda para o perÃodo de 2002. A metodologia empregada para alcanÃar essa finalidade consiste na utilizaÃÃo da tÃcnica de combinaÃÃo de previsÃes. Especificamente, combinam-se os resultados de previsÃo advindos de trÃs mÃtodos diferentes: tÃcnica do alisamento exponencial, metodologia de Box-Jenkins (modelos ARIMA) e modelos vetoriais de correÃÃo de erro. Obtida a previsÃo final, compara-se este resultado com os valores reais observados da sÃrie do impo

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Werngren, Simon. "Comparison of different machine learning models for wind turbine power predictions." Thesis, Uppsala universitet, Avdelningen för systemteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-362332.

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The goal of this project is to compare different machine learning algorithms ability to predict wind power output 48 hours in advance from earlier power data and meteorological wind speed predictions. Three different models were tested, two autoregressive integrated moving average (ARIMA) models one with exogenous regressors one without and one simple LSTM neural net model. It was found that the ARIMA model with exogenous regressors was the most accurate while also beingrelatively easy to interpret and at 1h 45min 32s had a comparatively short training time. The LSTM was less accurate, harder

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Tibulo, Cleiton. "MODELOS DE SÉRIES TEMPORAIS APLICADOS A DADOS DE UMIDADE RELATIVA DO AR." Universidade Federal de Santa Maria, 2014. http://repositorio.ufsm.br/handle/1/8334.

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Time series model have been used in many areas of knowledge and have become a current necessity for companies to survive in a globalized and competitive market, as well as climatic factors that have always been a concern because of the different ways they interfere in human life. In this context, this work aims to present a comparison among the performances by the following models of time series: ARIMA, ARMAX and Exponential Smoothing, adjusted to air relative humidity (UR) and also to verify the volatility present in the series through non-linear models ARCH/GARCH, adjusted to residues of the

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14

Almeida, Antonia Fabiana Marques. "AnÃlise Comparativa da AplicaÃÃo de Modelos para ImputaÃÃo do Volume MÃdio DiÃrio de SÃries HistÃricas de Volume de TrÃfego." Universidade Federal do CearÃ, 2010. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=7012.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>Para melhorias do sistema rodoviÃrio, tanto no que se refere Ã infra-estrutura quanto Ã operaÃÃo, Ã necessÃrio a realizaÃÃo de estudos e planejamento, buscando a melhor utilizaÃÃo dos recursos existentes. Para tanto, faz-se o uso de uma importante medida de trÃfego, o volume veicular. Os dados de trÃfego sÃo coletados por meio manuais ou eletrÃnicos, porÃm, ambos podem apresentar falhas e nÃo coletar os dados em sua totalidade. No caso dos equipamentos eletrÃnicos de contagem, a coleta contÃnua pode formar uma sÃrie histÃrica, que,

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15

Sans, Fuentes Carles. "Markov Decision Processes and ARIMA models to analyze and predict Ice Hockey player’s performance." Thesis, Linköpings universitet, Statistik och maskininlärning, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-154349.

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In this thesis, player’s performance on ice hockey is modelled to create newmetricsby match and season for players. AD-trees have been used to summarize ice hockey matches using state variables, which combine context and action variables to estimate the impact of each action under that speciﬁc state using Markov Decision Processes. With that, an impact measure has been described and four player metrics have been derived by match for regular seasons 2007-2008 and 2008-2009. General analysis has been performed for these metrics and ARIMA models have been used to analyze and predict players perfo

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Shakeri, Mohammad Taghi. "Statistical modelling of medical time series data : the dynamic sway magnetometry test." Thesis, University of Newcastle Upon Tyne, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369783.

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17

naz, saima. "Forecasting daily maximum temperature of Umeå." Thesis, Umeå universitet, Institutionen för matematik och matematisk statistik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-112404.

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The aim of this study is to get some approach which can help in improving the predictions of daily temperature of Umeå. Weather forecasts are available through various sources nowadays. There are various software and methods available for time series forecasting. Our aim is to investigate the daily maximum temperatures of Umeå, and compare the performance of some methods in forecasting these temperatures. Here we analyse the data of daily maximum temperatures and find the predictions for some local period using methods of autoregressive integrated moving average (ARIMA), exponential smoothing

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18

Kinene, Alan. "FORECASTING OF THE INFLATION RATES IN UGANDA: : A COMPARISON OF ARIMA, SARIMA AND VECM MODELS." Thesis, Örebro universitet, Handelshögskolan vid Örebro Universitet, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-49388.

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Reis, Daniel Leal de Paula Esteves dos. "Análise de desempenho de indicadores de volatilidade." Universidade Federal de Juiz de Fora, 2011. https://repositorio.ufjf.br/jspui/handle/ufjf/2124.

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Submitted by Renata Lopes (renatasil82@gmail.com) on 2016-07-18T14:26:58Z No. of bitstreams: 1 daniellealdepaulaestevesdosreis.pdf: 1239258 bytes, checksum: 75cc07cdf6eba15d62c43b78ac783fbc (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2016-07-22T15:03:54Z (GMT) No. of bitstreams: 1 daniellealdepaulaestevesdosreis.pdf: 1239258 bytes, checksum: 75cc07cdf6eba15d62c43b78ac783fbc (MD5)<br>Made available in DSpace on 2016-07-22T15:03:54Z (GMT). No. of bitstreams: 1 daniellealdepaulaestevesdosreis.pdf: 1239258 bytes, checksum: 75cc07cdf6eba15d62c4

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Zhang, Ying, and Hailun Wu. "A comparison of the prediction performances by the linear models and the ARIMA model : Take AUD/JPY as an example." Thesis, Umeå University, Umeå School of Business, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1047.

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<p>With the development of the financial markets, the foreign exchange market has become more and more important for investors. The daily volume of business dealt with on the foreign exchange markets in 1998 was estimated to be over $2.5 trillion dollars (the daily volume on New York Stock Exchanges is about $20 billion). Today (2006) it may be about $5 trillion dollars. More and more people notice the foreign exchange market, and more and more sophisticated investors research such markets. The purpose of this thesis is to compare different methods to forecast the exchange rate of the money pa

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Pellegrini, Tiago Ribeiro. "Uma avaliação de métodos de previsão aplicados à grandes quantidades de séries temporais univariadas." Universidade Federal de São Carlos, 2012. https://repositorio.ufscar.br/handle/ufscar/4563.

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Made available in DSpace on 2016-06-02T20:06:07Z (GMT). No. of bitstreams: 1 4757.pdf: 552745 bytes, checksum: 4f9bf1ad04dfca4e80bbfdf36c909f6f (MD5) Previous issue date: 2012-12-06<br>Financiadora de Estudos e Projetos<br>Time series forecasting is probably one of the most primordial interests on economics and econometrics, and the literature on this subject is extremely vast. Due to technological growth in recent decades, large amounts of time series are daily collected; which, in a first moment, it requires forecasts according a fixed horizon; and on the second moment the forecasts must b

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Dongo, Kouadio Kouman. "Forecasting the Chinese Futures Markets Prices of Soy Bean and Green Bean Commodities." Digital Archive @ GSU, 2007. http://digitalarchive.gsu.edu/math_theses/23.

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Using both single and vector processes, we fitted the Box-Jenkin’s ARIMA model and the Vector Autoregressive model following the Johansen approach, to forecast soy bean and green bean prices on the Chinese futures markets. The results are encouraging and provide empirical evidence that the vector processes perform better than the single series. The co-integration test indicated that the null hypothesis of no co-integration among the relevant variables could be rejected. This is one of the most important findings in this paper. The purposes for analyzing and modeling the series jointly are to u

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Rasoul, Ryan. "Comparison of Forecasting Models Used by The Swedish Social Insurance Agency." Thesis, Mälardalens högskola, Akademin för utbildning, kultur och kommunikation, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-49107.

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We will compare two different forecasting models with the forecasting model that was used in March 2014 by The Swedish Social Insurance Agency ("Försäkringskassan" in Swedish or "FK") in this degree project. The models are used for forecasting the number of cases. The two models that will be compared with the model used by FK are the Seasonal Exponential Smoothing model (SES) and Auto-Regressive Integrated Moving Average (ARIMA) model. The models will be used to predict case volumes for two types of benefits: General Child Allowance “Barnbidrag” or (BB_ABB), and Pregnancy Benefit “Graviditetsp

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Wang, Shuchun. "Exponential Smoothing for Forecasting and Bayesian Validation of Computer Models." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/19753.

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Despite their success and widespread usage in industry and business, ES methods have received little attention from the statistical community. We investigate three types of statistical models that have been found to underpin ES methods. They are ARIMA models, state space models with multiple sources of error (MSOE), and state space models with a single source of error (SSOE). We establish the relationship among the three classes of models and conclude that the class of SSOE state space models is broader than the other two and provides a formal statistical foundation for ES methods. To better u

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Mohamed, Zaid. "Forecasting electricity consumption: a comparison of growth curves, econometric and ARIMA models for selected countries and world regions." Thesis, University of Canterbury. Electrical and Computer Engineering, 2004. http://hdl.handle.net/10092/5644.

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This thesis presents six forecasting models for annual electricity consumption based on various time series extrapolation techniques. The proposed models are based on growth curves, multiple linear regression analysis using economic and demographic variables (referred to as the Combined model) and autoregressive integrated moving average (ARIMA) techniques. The proposed models are applied to electricity consumption data of New Zealand, the Maldives, the United States of America and the United Kingdom. The models are also applied to the electricity consumption data of various world regions and

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Paretkar, Piyush S. "Short-Term Forecasting of Power Flows over Major Pacific Northwestern Interties: Using Box and Jenkins ARIMA Methodology." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/35392.

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The deregulation of the Electricity Sector in US has led to a tremendous increase in the inter-regional wholesale electricity trade between neighboring utilities or regions. For instance, the generation deficit regions may choose to import power from surplus regions; thus the wholesale electricity market prices in the regions are also affected by the dynamics of its electricity trade with other regions. Valuable insights into such imports/exports ahead of time have become crucial market intelligence for the various academicians and the market players associated with the industry. In this thesi

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Furtado, Juliana Haetinger. "ESTUDO DO EMPREGO FORMAL POR SETOR DE ATIVIDADE ECONÔMICA NA REGIÃO SUL DO BRASIL DE 2003 A 2014." Universidade Federal de Santa Maria, 2016. http://repositorio.ufsm.br/handle/1/8396.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The global and national political and economic situation reflects directly on changes in the labor market. Concern about the employability, generate new jobs, as well as security and formality of these, and, places that no longer exist causing unemployment, it is constantly agenda in the academic literature, the media and at the same time government concern. In this context, the objective in this research was to analyze the absolute indicators of formal employment, initially in the eight sectors of the economy (mineral extraction,

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Vera, Barberán José María. "Adding external factors in Time Series Forecasting : Case study: Ethereum price forecasting." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-289187.

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The main thrust of time-series forecasting models in recent years has gone in the direction of pattern-based learning, in which the input variable for the models is a vector of past observations of the variable itself to predict. The most used models based on this traditional pattern-based approach are the autoregressive integrated moving average model (ARIMA) and long short-term memory neural networks (LSTM). The main drawback of the mentioned approaches is their inability to react when the underlying relationships in the data change resulting in a degrading predictive performance of the mode

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Woodworth, Douglas Wayne. "What is happening to the mortgage insurance sales of the Canada Mortgage and Housing Corporation?, ARIMA models and ex post forecasts." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq23845.pdf.

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Zimmer, Zachary. "Predicting NFL Games Using a Seasonal Dynamic Logistic Regression Model." VCU Scholars Compass, 2006. http://scholarscompass.vcu.edu/etd_retro/97.

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The article offers a dynamic approach for predicting the outcomes of NFL games using the NFL games from 2002-2005. A logistic regression model is used to predict the probability that one team defeats another. The parameters of this model are the strengths of the teams and a home field advantage factor. Since it assumed that a team's strength is time dependent, the strength parameters were assigned a seasonal time series process. The best model was selected using all the data from 2002 through the first seven weeks of 2005. The last weeks of 2005 were used for prediction estimates.

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Mezzomo, Meire. "AVALIAÇÃO DA QUALIDADE DO PROCESSO DE LINGOTAMENTO CONTÍNUO NA PRESENÇA DE CORRELAÇÃO CRUZADA." Universidade Federal de Santa Maria, 2013. http://repositorio.ufsm.br/handle/1/8290.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>In the current competitive market, a great part of companies has as the main goal the search for continuous improvement of their products and services. Therefore, the application of statistical methods has great relevance in the quality evaluation, helping in the understanding and monitoring of the processes. In such context, the present study concerns to the use of multivariate control charts in the evaluation of the productive processes in the presence of cross-correlation, which the objective is to verify the continuous casting

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Caiado, Aníbal Jorge Da Costa Cristóvão. "Taxas de juro e inflação em Portugal : testes e modelos de previsão." Master's thesis, Instituto Superior de Economia e Gestão, 1997. http://hdl.handle.net/10400.5/16213.

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Mestrado em Matemática Aplicada à Economia e à Gestão<br>O propósito do presente trabalho é modelizar quatro sucessões cronológicas de taxas de juro activas e passivas das instituições bancárias em Portugal para os meses de Junho de 1987 a Junho de 1996, e analisar as suas relações de causalidade com a taxa de inflação. A ocorrência de determinados acontecimentos que interferiram com o comportamento das taxas de juro nominais, como por exemplo, a supressão dos preços máximos e mínimos fixados administrativamente para as operações de empréstimos e depósitos bancários, ou o estabelecimento da li

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Altin, Mehmet. "Economic Sentiment Indicator as a Demand Determinant in Tourism: A Case of Turkey." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/42577.

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Tourism is one of the fastest growing industries in the world, employing approximately 220 million people and generating over 9.4% of the world's GDP. The growing contribution of tourism is accompanied by an increased interest in understanding the major factors which influence visitation levels to those countries. Therefore, finding the right variables to understand and estimate tourism demand becomes very important and challenging in policy formulations. The purpose of this study is to introduce Economic Sentiment Indicator (ESI) to the field of tourism demand studies. Using ESI in demand ana

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Wu, Ling. "Stochastic Modeling and Statistical Analysis." Scholar Commons, 2010. https://scholarcommons.usf.edu/etd/1813.

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The objective of the present study is to investigate option pricing and forecasting problems in finance. This is achieved by developing stochastic models in the framework of classical modeling approach. In this study, by utilizing the stock price data, we examine the correctness of the existing Geometric Brownian Motion (GBM) model under standard statistical tests. By recognizing the problems, we attempted to demonstrate the development of modified linear models under different data partitioning processes with or without jumps. Empirical comparisons between the constructed and GBM models are o

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Strohe, Hans Gerhard. "Time series analysis : textbook for students of economics and business administration ; [part 2]." Universität Potsdam, 2004. http://stat.wiso.uni-potsdam.de/documents/zeitr/Time_Series_Analysis_Script2.pdf.

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Alsaedi, Yasir H. "An Investigation of the Effects of Solar and Wind Prices on the Australia Electricity Spot and Options Markets: A Time Series Analysis." Thesis, Griffith University, 2021. http://hdl.handle.net/10072/410472.

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Electricity pricing is recognised as being among the most important contemporary policy issues in Australia, and it also represents a critical component of current discussions concerning energy and climate-change policies. Attempts to move forward with energy and climate-change policies have been mostly stymied by concerns regarding potential increases in electricity prices. In relation to such policy discussions, renewable electricity generation is currently considered to be a fundamental factor influencing electricity prices. Due to the increasing penetration of both wind and solar power gen

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Chen, Kun. "Regularized multivariate stochastic regression." Diss., University of Iowa, 2011. https://ir.uiowa.edu/etd/1209.

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In many high dimensional problems, the dependence structure among the variables can be quite complex. An appropriate use of the regularization techniques coupled with other classical statistical methods can often improve estimation and prediction accuracy and facilitate model interpretation, by seeking a parsimonious model representation that involves only the subset of revelent variables. We propose two regularized stochastic regression approaches, for efficiently estimating certain sparse dependence structure in the data. We first consider a multivariate regression setting, in which the larg

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Jacobs, William. "COMBINAÇÃO DAS PREVISÕES DOS MODELOS DE BOX-JENKINS E MLP/RNA PARA A PREVISÃO DE DEMANDA NO PLANEJAMENTO DA PRODUÇÃO." Universidade Federal de Santa Maria, 2014. http://repositorio.ufsm.br/handle/1/8327.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>A forecast of future demand for the products is the main variable to be considered in the planning and in production control in organizations. Two methods of time series forecasting often used in the literature are the ARIMA and MLP/RNA models. A practice that began in 1969 and has consolidated for greater accuracy is the combination of individual forecasts from two or more models. Considering the need for organizations by predictive techniques that generate better results, this study aims to predict the future values of a time ser

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Ghawi, Christina. "Forecasting Volume of Sales During the Abnormal Time Period of COVID-19. An Investigation on How to Forecast, Where the Classical ARIMA Family of Models Fail." Thesis, KTH, Matematisk statistik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-302396.

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During the COVID-19 pandemic, customer shopping habits have changed. Some industries experienced an abrupt shift during the pandemic outbreak while others navigate in new normal states. For some merchants, the highly-uncertain new phenomena of COVID-19 expresses as outliers in time series of volume of sales. As forecasting models tend to replicate past behavior of a series, outliers complicates the procedure of forecasting; the abnormal events tend to unreliably replicate in forecasts of the subsequent year(s). In this thesis, we investigate how to forecast volume of sales during the abnormal

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Cheng, Teddy Man Lai. "Application of filtering theory for optimum strategies in stock market investment." Thesis, Queensland University of Technology, 1997.

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Hauser, Michael A. "Maximum Likelihood Estimators for ARMA and ARFIMA Models. A Monte Carlo Study." Department of Statistics and Mathematics, Abt. f. Angewandte Statistik u. Datenverarbeitung, WU Vienna University of Economics and Business, 1998. http://epub.wu.ac.at/794/1/document.pdf.

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We analyze by simulation the properties of two time domain and two frequency domain estimators for low order autoregressive fractionally integrated moving average Gaussian models, ARFIMA (p,d,q). The estimators considered are the exact maximum likelihood for demeaned data, EML, the associated modified profile likelihood, MPL, and the Whittle estimator with, WLT, and without tapered data, WL. Length of the series is 100. The estimators are compared in terms of pile-up effect, mean square error, bias, and empirical confidence level. The tapered version of the Whittle likelihood turns out to be a

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Muller, Daniela. "Estimação para os parâmetros de processos estocásticos estacionários com característica de longa dependência." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 1999. http://hdl.handle.net/10183/127017.

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Estudos recentes em séries temporais direcionam-se àquelas que apresentam característica de longa dependência, ou seja, séries temporais nas quais a dependência entre observações distantes não é desprezível. Neste trabalho, analisamos o modelo ARFIN!A(p, d,q ), para dE (0,0;0,5), que apresenta a. característica de longa dependência. Como estimativas para o grau de diferenciação d consideramos os estimadores obtidos através da função periodograma, da função periodograma suavizado e da função de máxima verossimilhança sugerida por Whittle, comparando a variância e o erro quadrático médio destes

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Silva, Thays Aparecida de Abreu [UNESP]. "Previsão de cargas elétricas através de um modelo híbrido de regressão com redes neurais." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/87107.

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Made available in DSpace on 2014-06-11T19:22:32Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-02-24Bitstream added on 2014-06-13T18:49:32Z : No. of bitstreams: 1 silva_taa_me_ilha.pdf: 370447 bytes, checksum: b861e5232da4742a12b7ae39aa142840 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Atualmente os sistemas elétricos de potência crescem em tamanho e complexidade e se faz necessário criar alternativas para minimizar o custo total de geração e operação. A previsão de cargas é uma tarefa importante para o planejamento e operação dos sistemas elétrico

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Silva, Thays Aparecida de Abreu. "Previsão de cargas elétricas através de um modelo híbrido de regressão com redes neurais /." Ilha Solteira : [s.n.], 2012. http://hdl.handle.net/11449/87107.

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Orientador: Anna Diva Plasencia Lotufo<br>Coorientador: Mara Lúcia Martins Lopes<br>Banca: Francisco Villarreal Alvarado<br>Banca: Luciana Cambraia Leite<br>Resumo: Atualmente os sistemas elétricos de potência crescem em tamanho e complexidade e se faz necessário criar alternativas para minimizar o custo total de geração e operação. A previsão de cargas é uma tarefa importante para o planejamento e operação dos sistemas elétricos, pois dela dependem outras tarefas como despacho econômico, fluxo de potência, análise de estabilidade, entre outras. Para tanto esta tarefa deve ser precisa para que

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Abalos, Choque Melisa. "Modelo Arima con intervenciones." Universidad Mayor de San Andrés. Programa Cybertesis BOLIVIA, 2009. http://www.cybertesis.umsa.bo:8080/umsa/2009/abalos_cme/html/index-frames.html.

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El desarrollo de gran parte de los modelos y métodos estadísticos, específicamente relacionados con series temporales, ha ido ligado al deseo de estudiar aplicaciones específicas dentro de diversos ámbitos científicos. El presente trabajo también surgió con el objetivo de resolver diversos problemas que se plantean dentro del ámbito econométrico, aunque también puede ser usado en otros ámbitos, todos ellos ligados con un conjunto de datos históricos y con una aplicación muy concreta al estudio del “egreso de divisas” en Bolivia. Se han estudiado a profundidad los modelos para series temporales

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Vadda, Praveen, and Sreerama Murthy Seelam. "Smart Metering for Smart Electricity Consumption." Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2476.

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In recent years, the demand for electricity has increased in households with the use of different appliances. This raises a concern to many developed and developing nations with the demand in immediate increase of electricity. There is a need for consumers or people to track their daily power usage in houses. In Sweden, scarcity of energy resources is faced during the day. So, the responsibility of human to save and control these resources is also important. This research work focuses on a Smart Metering data for distributing the electricity smartly and efficiently to the consumers. The main d

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Логін, Вадим Вікторович. "Моделі для прогнозування характеристик трафіка цифрової реклами". Master's thesis, Київ, 2018. https://ela.kpi.ua/handle/123456789/23748.

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Магістерська дисертація: 112 с., 48 рис., 40 табл., 3 додатки і 30 джерел. Об’єкт дослідження – трафік цифрової реклами у формі статистичних даних. Предмет дослідження – моделі та методи аналізу даних у формі часових рядів, методи прикладної статистики. Мета роботи – побудова моделей часових рядів для прогнозування найважливіших характеристик трафіка цифрової реклами. Методи дослідження – моделі часових рядів для прогнозування даних та порівняльний аналіз отриманих моделей. У даній роботі наведені результати побудови моделей часових рядів, що призначені для прогнозування найважливіши

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Cruz, Cristovam Colombo dos Santos. "AnÃlise de sÃries temporais para previsÃo mensal do icms: o caso do PiauÃ." Universidade Federal do CearÃ, 2007. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=1648.

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nÃo hÃ<br>Esta DissertaÃÃo trata de pesquisa sobre a anÃlise de sÃries temporais para previsÃo mensal do Imposto Sobre CirculaÃÃo e Mercadorias e PrestaÃÃo de ServiÃos â ICMS no estado do PiauÃ. Objetiva-se com essa pesquisa oferecer aos gestores do estado um modelo de previsÃo consistente e com bom poder preditivo, de forma a contribuir com a gestÃo financeira estadual. No trabalho, utilizaram-se os modelos ARIMA e FunÃÃo de TransferÃncia para realizar previsÃes, bem como o Modelo CombinaÃÃo de PrevisÃes. A dissertaÃÃo apresenta um diagnÃstico do ICMS no estado do PiauÃ e uma revisÃo da liter

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Ribeiro, Liliana Patrícia Teixeira. "Aplicação de modelos econométricos na previsão de preço de azeites." Master's thesis, Instituto Superior de Economia e Gestão, 2020. http://hdl.handle.net/10400.5/20862.

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Mestrado em Econometria Aplicada e Previsão<br>O presente relatório tem por base as atividades desenvolvidas no estágio na empresa Gallo Worldwide, nomeadamente a análise das bases de dados da empresa de modo a efetuar a previsão do preço do azeite extra-virgem, azeite virgem e lampante. Uma vez que a modelação dos preços dos azeites é realizada através da modelação de séries temporais, existem diversos modelos que podem ser aplicados. Segundo a literatura científica analisada, a estimação das séries temporais utilizadas pode ser realizada através do modelo ARIMA, ARIMAX, GARCH e SUR. Neste se

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Ramos, Anthony Kojo. "Forecasting Mortality Rates using the Weighted Hyndman-Ullah Method." Thesis, Mälardalens högskola, Akademin för utbildning, kultur och kommunikation, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-54711.

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The performance of three methods of mortality modelling and forecasting are compared. These include the basic Lee–Carter and two functional demographic models; the basic Hyndman–Ullah and the weighted Hyndman–Ullah. Using age-specific data from the Human Mortality Database of two developed countries, France and the UK (England&Wales), these methods are compared; through within-sample forecasting for the years 1999-2018. The weighted Hyndman–Ullah method is adjudged superior among the three methods through a comparison of mean forecast errors and qualitative inspection per the dataset of th

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