[R] Beginner: Homogenity of Variances

[Michael Friendly]

"Markus Koesters" <Markus.Koesters at uni-jena.de> wrote:

>for my meta-analysis I try to test if two varainces are equal without 
>using the raw scores. I have is the SD's, N's and the Means.
>I want to test the variances from dependent and independend 
>samples.
>I assume I can use the var.test procedure for the independent 
>samples, but what about the dependent samples ? Has anyone an 
>idea how to realise this with R ?
>Thanks in advance
>
>  
>
For independent samples there is a simple technique described by Larsen, 
Am. Stat, May 1992
for turning summary statistics back into a data set with an equivalent 
ANOVA summary.

This is implemented and described in my STAT2DAT macro,
 http://www.math.yorku.ca/SCS/sasmac/stat2dat.html

It should be easy to translate into R.

-- 
Michael Friendly     Email: friendly at yorku.ca 
Professor, Psychology Dept.
York University      Voice: 416 736-5115 x66249 Fax: 416 736-5814
4700 Keele Street    http://www.math.yorku.ca/SCS/friendly.html
Toronto, ONT  M3J 1P3 CANADA