Date:         Mon, 14 Jun 2004 12:21:50 +0200
Reply-To:     la volta statistics <schmidhauser@lavolta.ch>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         la volta statistics <schmidhauser@lavolta.ch>
Subject:      Cohen's d
Content-Type: text/plain; charset="iso-8859-1"

Dear List

I had recently an argument with a colleague about the Cohen's d (effect size
magnitude). He said that Cohen's d is mainly dependent of the sample size. I
argued, that
d = M1 – M2 / sd
(where M1 and M2 are the means of the measurements in group 1 and group 2
and sd is the standard deviation)
is trough the division by the standard deviation independent of the sample
size. Am I wrong here?

Thanks, Christian


*******************************
la volta statistics
Christian Schmidhauser, Dr.phil.II
Weinbergstrasse 108
Ch-8006 Zürich
Tel: +41 (043) 233 98 01
Fax: +41 (043) 233 98 02
mailto:schmidhauser@lavolta.ch