attenuated variance
[əˈtɛnjueɪtɪd ˈvɛriəns]
nounpl: attenuated variances
variância atenuada
1. In statistics and psychometrics, a reduction in the observed variance of a variable due to measurement error, missing data, or restriction of range; the actual variance is larger than what is measured
The attenuated variance in test scores resulted from the limited range of ability levels in the sample.
A variância atenuada nos escores de teste resultou do intervalo limitado de níveis de habilidade na amostra.
2. A statistical phenomenon where the correlation between two variables appears weaker than it actually is because of measurement error in one or both variables
Due to attenuated variance, the researcher corrected the correlation coefficient using the attenuation formula.
Devido à variância atenuada, o pesquisador corrigiu o coeficiente de correlação usando a fórmula de atenuação.
This is a technical term primarily used in academic, statistical, and psychometric contexts in both Brazil and the United States. It is essential in research methodology, particularly in psychology, education, and social sciences where measurement precision is critical. The concept reflects the scientific understanding that observed measurements often underestimate true effects due to imperfect measurement tools.
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