levene_test | R Documentation |
Provide a pipe-friendly framework to easily compute Levene's test for homogeneity of variance across groups.
Wrapper around the function leveneTest()
, which can
additionally handles a grouped data.
levene_test(data, formula, center = median)
data |
a data frame for evaluating the formula or a model |
formula |
a formula |
center |
The name of a function to compute the center of each group; mean gives the original Levene's test; the default, median, provides a more robust test. |
a data frame with the following columns: df1, df2 (df.residual), statistic and p.
# Prepare the data data("ToothGrowth") df <- ToothGrowth df$dose <- as.factor(df$dose) # Compute Levene's Test df %>% levene_test(len ~ dose) # Grouped data df %>% group_by(supp) %>% levene_test(len ~ dose)
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