Information (VIOLLON Stephanie )

Subject: Information
From:    VIOLLON Stephanie  <viollon(at)U-CERGY.FR>
Date:    Wed, 23 Jun 1999 10:51:38 +0200

I have conducted an experiment where there was a dependent variable (S) and two independent variables (A and V). I have carried out an analysis of variance, which showed a significant main effect of both variables (A and V) on the dependent variable (S), and a significant interaction between these both variables (A x V). I'd like to assess whether the effects of the variables A and V were very strong (to assess the "strength" of these effects). I was adviced to use a statistical variable that I do not know at all. This is: "omega square" for estimating the degree of association between independent and dependent variables. I was told that most statistical packages use a simpler formula (for instance, in SPSS, there is "eta"). The problem is that my stats package is Statistica and I can't find "omega square" neither "eta". Is there someone who has yet calculated this variable (omega square? eta?) and who knows how calculating it with Statistica? Thank you in advance. Stephanie Viollon.

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