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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.