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
?t.test
t.test has a var.equal option that you can set to FALSE to use the Welch
approximation.
-Christos
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Peter Flom
Sent: Tuesday, March 28, 2006 4:41 PM
To: [EMAIL PROTECTED]
Subject: [R] Welch test
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
