[R] Welch test for equality of variance

[Peter Ehlers]

Peter,

I don't know the Welch test for variances, but you might consider
using the Fligner-Killeen test (fligner.test) or one of the
Levene test variations (package:car). A useful reference is

WJ Conover, ME Johnson, MM Johnson. 1981. Technometrics 23:351

with a minor correction in Technometrics 26:302.

Peter Ehlers


Peter Flom wrote:

> Hello
> 
> Using R 2.2.1 on a Windows machine.
> 
> Has anyone programmed the Welch test for equality of variances?
> 
> I tried RSiteSearch, but this gave references to t test and
> oneway.test, which are not quite what I need.....I need the Welch test
> itself, for use in a meta-analysis (to determine if variances are
> equal).
> 
> 
> TIA
> 
> Peter
> 
> 
> 
> Peter L. Flom, PhD
> Assistant Director, Statistics and Data Analysis Core
> Center for Drug Use and HIV Research
> National Development and Research Institutes
> 71 W. 23rd St
> http://cduhr.ndri.org
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