Teste de Levene para Variância
Realize o teste de Levene para verificar a homogeneidade de variâncias entre grupos. Pré-requisito para ANOVA e testes paramétricos.
Levene W
3.5625
df12
df257
Levene W vs Total N
Formula
Levene Test
W = [(N-k)/(k-1)] * [SS_between/SS_within]
Tests equal variances using absolute deviations from group means.
Exemplo Resolvido
N=60, 3 groups.
- 01W = (57/2) * (15/120) = 3.56
Perguntas Frequentes
Why vs Bartlett?
More robust to non-normality.
When needed?
Before ANOVA or t-tests assuming equal variances.
Brown-Forsythe?
Uses medians instead of means; even more robust.
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