leveneTest {psichomics}R Documentation

Levene's test

Description

Performs a Levene's test to assess the equality of variances

Usage

leveneTest(x, g, centers = median)

Arguments

x

a numeric vector of data values, or a list of numeric data vectors. Non-numeric elements of a list will be coerced, with a warning.

g

a vector or factor object giving the group for the corresponding elements of x. Ignored with a warning if x is a list.

centers

Function used to calculate how much values spread (median by default; another common function used is mean)

Details

The implementation of this function is based on car:::leveneTest.default with a more standard result.

Value

A list with class "htest" containing the following components:

statistic

the value of the test statistic with a name describing it.

p.value

the p-value for the test.

method

the type of test applied.

data.name

a character string giving the names of the data.

Examples


vals <- sample(30, replace=TRUE)
group <- lapply(list("A", "B", "C"), rep, 10)
group <- unlist(group)
psichomics:::leveneTest(vals, group)

## Using Levene's test based on the mean
psichomics:::leveneTest(vals, group, mean)

[Package psichomics version 1.8.2 Index]