Date:         Tue, 1 Feb 2005 03:26:55 GMT
Reply-To:     Pablo Mora Olmedo <pmora@puc.cl>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Pablo Mora Olmedo <pmora@puc.cl>
Subject:      Re: Effect-size measure in crosstab
Comments: To: Richard Ristow <wrristow@mindspring.com>
In-Reply-To:  <5.1.0.14.2.20050131220117.031cc2e0@pop.mindspring.com>
Content-Type: text/plain; format=flowed; charset="iso-8859-1"

Richard,
A common effect size measure for crosstabs is "w."

You can find a formula in this website:
http://www.psycho.uni-duesseldorf.de/aap/projects/gpower/reference/reference
_manual_10.html

I believe there are a couple of websites that compute w after you enter your
raw data.
Pass (power analysis program can do it too).  Check G-power, it's a free
power analysis software.
P