Performs Levene's test to assess equality of variances between groups.
Usage
equal_test(data, var, group, center = "median")
Value
Logical value:
TRUE: Variances are equal, p-value more than 0.05
FALSE: Variances are unequal or an error occurred during testing
Arguments
data
A data frame containing the variables to be tested.
var
A character string specifying the numeric variable in data to test.
group
A character string specifying the grouping variable in data.
center
A character string specifying the center to use in Levene's test. Default is 'median', which is more robust than the mean.
Methodology for Equality of Variances
Levene's test is the default method adopted in SPSS, the original Levene's test select center = mean, but here select center = median for a more robust test