(no subject)
Cross-posted to a couple of places, even my own journal. I know about some stats geeks on my FList so don't pretend you're not there.
I need someone to help me confirm my assumptions on how to calculate effect sizes.
What I have done is run a two-way subjects mixed ANOVA and my course requires us to give η2 (eta squared in case the symbol doesn't show up) as an effect size. We're not supposed to use the partial eta squared as provided by SPSS, so this means I have to do some calculating by hand. While usually η2 is calculated by dividing the Sum of Squares for the particular treatment by the Total Sum of Squares, I'm a bit confused as to what makes up the Total Sum of Squares in a 2-way mixed ANOVA (I have SPSS output to work with). What I've done is to add up the Sum of Squares for the within-subjects treatment, that of the interaction between within and between-subjects, the error of the within-subjects variable and the error of the between-subjects variable. Does this make sense or mostly is this correct?
Thanks in advance if anyone can help me out.
I need someone to help me confirm my assumptions on how to calculate effect sizes.
What I have done is run a two-way subjects mixed ANOVA and my course requires us to give η2 (eta squared in case the symbol doesn't show up) as an effect size. We're not supposed to use the partial eta squared as provided by SPSS, so this means I have to do some calculating by hand. While usually η2 is calculated by dividing the Sum of Squares for the particular treatment by the Total Sum of Squares, I'm a bit confused as to what makes up the Total Sum of Squares in a 2-way mixed ANOVA (I have SPSS output to work with). What I've done is to add up the Sum of Squares for the within-subjects treatment, that of the interaction between within and between-subjects, the error of the within-subjects variable and the error of the between-subjects variable. Does this make sense or mostly is this correct?
Thanks in advance if anyone can help me out.