Rule of Thumb for Partial Eta Square

Posted by Salbod on Mar 25, 2015; 3:01pm
URL: http://spssx-discussion.165.s1.nabble.com/Rule-of-Thumb-for-Partial-Eta-Square-tp5729057.html

Is there a standard small, medium, and large values for partial eta squared in a factorial ANOVA?
I wasn't able to find them in Cohen's power analysis book (1988) nor was I able to find a reference on this site.

I took some data (2 X 2) that accompanied (Chapter 9) Cohen, Cohen, West, and Aiken's book. The data shows three types of interactions (I used YC). I analyzed the dataset using Regression(Linear): contrast coding and ZPP.  I analyzed the same dataset using ANOVA, requesting ETASQ.  I found the squared partial rs to approximate the partial eta squares. Does that imply that I can use Cohen's r effect sizes?

Any suggestions are most welcome.

TIA, Stephen Salbod, Pace University, NYC
 
CohenData.sav