ezANOVA: Add other effect size measures

[crsh]

Hi Mike,

I was wondering whether you thought about adding other effect size measures to the ezANOVA result object. Specifically, I would like to see a partial eta squared. Many reviewers of journals in the field of experimental psychology prefer partial eta squared over generalized eta squared.

I know it is possible to get the sums of squares to compute partial eta squared, but I think it would be nice to have it as part of the regular result object.

Cheers, crsh