Os coeficientes de semelhança como alternativa
Os coeficientes de semelhança como alternativa aos coeficientes de fidelidade na medição de atitudes por questionário em amostras pequenas. Este artigo foca o problema da unidimensionalidade como pré-requisito da fidelidade na análise de atitudes por questionário em amostras pequenas. Duas técnicas tradicionais usadas para analisar a dimensionalidade - a análise de componentes principais e a análise factorial - são criticadas e, em alternativa, propõe-se a utilização de coeficientes de semelhança. Relata-se um estudo empírico nas atitudes dos enfermeiros em relação à eutanásia para exemplificar as vantagens dessa técnica alternativa. This paper focuses on the problem of unidimensionality as a prerequisite for reliability in the analysis of attitudes by questionnaire in small samples. Two traditional techniques used to analyse dimensionality - principal component analysis and factor analysis - are criticised and, similarity coefficients are proposed as an alternative.
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My name is John Voyce. I taught at university level from 1980 until my retirement in January this year. I taught a wide variety of subjects including Probability, Statistics, Sociology, Anthropology, Research Methods and English, and have published papers in English and Portuguese. You can find out more about me by visiting Linkedin or ResearchGate. Over the years I have gained a lot of experience in a number of diverse subjects of an academic nature. I studied Sociology at polytechnic before the polytechnics became integrated into the university system. In Portugal, I studied Urban and Regional Planning for my master's degree while teaching English as a Foreign Language. In my retirement years I will be able to dedicate my time to freelance academic work.