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Contributo das técnicas de análise fatorial para o estudo do programa "ocupação científica de jovens nas férias"
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Authors
Advisor(s)
Abstract(s)
Neste trabalho abordam-se as técnicas de Análise Fatorial Exploratória e de Análise
Fatorial Confirmatória, visando a sua aplicação a um questionário administrado a 3519
participantes do Programa “Ocupação Científica de Jovens nas Férias”, ao longo de um
período de seis anos (2005-2010). Apresentam-se as formulações teóricas dos modelos,
métodos de estimação e de validação dos mesmos. A aplicação destas técnicas revelou a
capacidade do questionário para captar uma estrutura fatorial (variáveis latentes ou
constructos) subjacente às variáveis que compõem o questionário, num contexto de
grande diversidade em termos da oferta de estágios, áreas científicas abrangidas e
natureza das instituições de acolhimento. Da análise resultou a identificação de
variáveis latentes, cuja estrutura foi verificada pela Análise Fatorial Confirmatória e
validada através de outras amostras. Resultou ainda um conjunto de recomendações
para uma reformulação do inquérito, de forma a abranger um leque mais alargado de
subescalas na avaliação da perceção dos participantes no programa, bem como a
sugestão de alargar a escala de Likert utilizada.
A practical application of Exploratory Factor Analysis and Confirmatory Factor Analysis is applied to the answers of a survey of 3519 secondary school students who attended a summer science internships programme promoted by the Portuguese National Agency for Scientific and Technological Culture – Ciência Viva, held between 2005 and 2010. It also covers fundamental concepts and estimation and validity techniques as well. It was found that these multivariate statistical techniques were appropriate to uncover the relevant factor structure (latent variables or constructs) within the context of an extremely diverse research setting, not only in terms of the internships’ characteristics but also in terms of the wide range of scientific subject and host institutions. The latent variables’ structure revealed by this analysis was confirmed by Confirmatory Factor Analysis and validated in other samples. The findings also provide recommendations for the revision of the survey’s questionnaire, in order to reach a larger set of subscales to assess the participant’s attitudes towards their experience in the internships, and suggest a five-point Likert’s scale.
A practical application of Exploratory Factor Analysis and Confirmatory Factor Analysis is applied to the answers of a survey of 3519 secondary school students who attended a summer science internships programme promoted by the Portuguese National Agency for Scientific and Technological Culture – Ciência Viva, held between 2005 and 2010. It also covers fundamental concepts and estimation and validity techniques as well. It was found that these multivariate statistical techniques were appropriate to uncover the relevant factor structure (latent variables or constructs) within the context of an extremely diverse research setting, not only in terms of the internships’ characteristics but also in terms of the wide range of scientific subject and host institutions. The latent variables’ structure revealed by this analysis was confirmed by Confirmatory Factor Analysis and validated in other samples. The findings also provide recommendations for the revision of the survey’s questionnaire, in order to reach a larger set of subscales to assess the participant’s attitudes towards their experience in the internships, and suggest a five-point Likert’s scale.
Description
Dissertação de Mestrado em Estatística, Matemática e Computação apresentada à Universidade Aberta
Keywords
Estatística Técnicas estatísticas Questionários Exploratory factor analysis Confirmatory factor analysis Structural equation modeling Science education Internships
Citation
Portela, Domingas Maria Pina - Contributo das técnicas de análise fatorial para o estudo do programa "ocupação científica de jovens nas férias" [Em linha]. Lisboa : [s.n.], 2012. VII, 77 [45] p.