[R] Test of Homogeneity of Variances

[Richardson, Patrick]

What are your hypotheses?  Once you state what they are, interpretation should be straightforward.



-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Daren Tan
Sent: Friday, August 22, 2008 11:18 AM
To: r-help at stat.math.ethz.ch
Subject: [R] Test of Homogeneity of Variances


I am testing the homogeneity of variances via bartlett.test and fligner.test. Using the following example, how should I interpret the p-value in order to accept or reject the null hypothesis ?

set.seed(5)
x <- rnorm(20)
bartlett.test(x, rep(1:5, each=4))


        Bartlett test of homogeneity of variances


data:  x and rep(1:5, each = 4)
Bartlett's K-squared = 1.7709, df = 4, p-value = 0.7778

fligner.test(x, rep(1:5, each=4))

     Fligner-Killeen test of homogeneity of variances


data:  x and rep(1:5, each = 4)
Fligner-Killeen:med chi-squared = 1.0819, df = 4, p-value = 0.8971

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