Calcular e apresentar tamanhos do efeito em trabalhos científicos (3): Guia para reportar os tamanhos do efeito para análises de regressão e ANOVAs

Palavras-chave: ANOVA, Análise de regressão, Tamanho do efeito, Valor p

Resumo

No primeiro número da Revista Portuguesa de Investigação Comportamental e Social foi revista a importância de calcular, indicar e interpretar os tamanhos do efeito para as diferenças de médias de dois grupos (família d dos tamanhos do efeito). Os tamanhos do efeito são uma métrica comum que permite comparar os resultados das análises estatísticas de diferentes estudos, informando sobre o impacto de um fator na variável em estudo e sobre a associação entre variáveis.

Depois de rever os tamanhos do efeito para as diferenças de médias entre dois grupos (Espirito-Santo e Daniel, 2015) e a maior parte da família r (Espirito-Santo e Daniel, 2017), faltava rever os tamanhos do efeito para a análise da variância. A análise da variância pode ser compreendida como uma extensão da família d a mais de dois grupos (ANOVA) ou como uma subfamília r em que a proporção da variabilidade é imputável a um ou mais fatores. Na subfamília r revista neste estudo, analisa-se a mudança na variável dependente que decorre de uma ou mais variáveis independentes. Esta análise debruça-se sobre os modelos lineares gerais, onde se incluem os modelos de regressão e a ANOVA.

Este artigo fornece as fórmulas para calcular os tamanhos do efeito mais comuns, revendo os conceitos básicos sobre as estatísticas e facultando exemplos ilustrativos computados no Statistical Package for the Social Sciences (SPSS). As orientações para a interpretação dos tamanhos do efeito são também apresentadas, assim como as cautelas no seu uso. Adicionalmente, o artigo acompanha-se de uma folha de cálculo em Excel para facilitar e agilizar os cálculos aos interessados.

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Biografia Autor

Helena Maria Amaral Espirito Santo, Instituto Superior Miguel Torga Coimbra, Portugal Centro de Investigação do Núcleo de Estudos e Intervenção Cognitivo-Comportamental Universidade de Coimbra
Professora Auxiliar, Neurociências, Neuropsicologia e Psicopatologia do AdultoCoordenadora, Departamento de Investigação & Desenvolvimento do ISMT 

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Publicado
2018-02-28
Como Citar
Espirito Santo, H. M. A., & Daniel, F. (2018). Calcular e apresentar tamanhos do efeito em trabalhos científicos (3): Guia para reportar os tamanhos do efeito para análises de regressão e ANOVAs. Revista Portuguesa De Investigação Comportamental E Social, 4(1), 43-60. https://doi.org/10.31211/rpics.2018.4.1.72
Secção
Artigo de Revisão