Variância média extraída e confiabilidade composta:
indicadores de precisão
Palavras-chave:
Fundamentos e Medidas em Psicologia, Variância média extraída, Confiabilidade composta, Validade, Precisão, Análise fatorial confirmatóriaResumo
A variância média extraída (VME) e a confiabilidade composta (CC) são indicadores associados à qualidade de uma medida. No entanto, é necessário compreender adequadamente a dinâmica dos cálculos da VME e da CC, bem como as suas relações com os conceitos de validade e precisão para evitar equívocos na interpretação dos seus resultados. No presente artigo, ilustramos, por meio de modelos unifatoriais simulados, como o número de itens e a homogeneidade das cargas fatoriais impactam nos valores da VME e da CC. Assim, problematizamos a utilização de pontos de cortes fixos para estes indicadores. Além disso, apresentamos argumentos endossando a VME como uma medida de precisão, e não de validade convergente.
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