Bartlett Test for Homogeneity of Variances

Usage

bartlett.test(x, g)

Arguments

x a numeric vector of data values, or a list of numeric data vectors.
g a vector or factor object giving the group for the corresponding elements of x. Ignored if x is a list.

Description

bartlett.test performs Bartlett's test of the null that the variances in each of the groups (samples) are the same.

Details

If x is a list, its elements are taken as the samples to be compared for homogeneity of variances, and hence have to be numeric data vectors. In this case, g is ignored, and one can simply use bartlett.test(x) to perform the test. If the samples are not yet contained in a list, use bartlett.test(list(x, ...)).

Otherwise, x must be a numeric data vector, and g must be a vector or factor object of the same length as x giving the group for the corresponding elements of x.

Value

A list of class "htest" containing the following components:
statistic Bartlett's K-square test statistic.
parameter the degrees of freedom of the approximate chi-square distribution of the test statistic.
p.value the p-value of the test.
method the string "Bartlett test for homogeneity of variances".
data.name a character string giving the names of the data.


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