[R] Welch test for equality of variance

[Christos Hatzis]

?t.test

t.test has a var.equal option that you can set to FALSE to use the Welch
approximation.

-Christos

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Peter Flom
Sent: Tuesday, March 28, 2006 4:41 PM
To: r-help at r-project.org
Subject: [R] Welch test for equality of variance

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
www.peterflom.com
New York, NY 10010
(212) 845-4485 (voice)
(917) 438-0894 (fax)

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