[R] Levene's test output

[John Fox]

Dear pieter,

On Fri, 21 Jun 2013 10:12:26 +0200
 pieter <dencoussie at gmail.com> wrote:
> Hey,
> I don't really get the output of the performed Levene's test.
> So in short.
> two data sets, one with 75 elements, one with 283.
> And I want to check whether they have the same variance.
> 
> I did a LeveneTest
> And this is the output:
> 
> Levene's Test for Homogeneity of Variance (center = median)
>         Df F value   Pr(>F)
> group   1  10.948 0.001033 **
>        356
> ---
> Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
> 
> So I would think that H0 is being rejected? for everything except 99.9%?

0.001033 is the p-value for the null hypothesis of equal variances.

> But what does the 356 mean?

The residual df for the test.

> Is this test performed correctly? 

I certainly hope so.

John

------------------------------------------------
John Fox
Sen. William McMaster Prof. of Social Statistics
Department of Sociology
McMaster University
Hamilton, Ontario, Canada
http://socserv.mcmaster.ca/jfox/

> group is a vector with 1's and 2's 
> appointing the two datasets...
> 
> 
> 
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