# NOT RUN {
# using simple data frame
value = c(7,2,4,4,8,3,61,2,80,4)
grp = rep(c("A","B"), each = 5)
ex_data = data.frame(value = value, grp = grp)
levenes.test(ex_data$value, group = ex_data$grp)
# using variable without NA values
levenes.test(NELS$famsize, group = NELS$gender)
# using variable with NA values
levenes.test(NELS$achrdg12, group = NELS$gender)
# }
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