# eta square

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• #1357
SA Welch
Member

I am very confused over something that should be very basic….my apologies but I really need some help.

eta square should tell you the percentage of variance in the dependent variable that is predicted by the independent variable.  But, if there are 2 sets of variances(one for each of two independent variables—say high school education  or college education) which variance is the one that has its variance predicted by the education level?

Sorry….this is on an exam and I am stuck,

Many thanks,

#1360
Dave Collingridge
Participant

If you are talking about general linear model ANOVA, there will be an eta square for each IV. The eta square for education level should be listed near the p-value for that IV in the statistical output. It would, of course, be listed in the same row as the variable name representing education level. Don’t confuse it with the R-squared value for the entire model.

#1359
SA Welch
Member

Hello Dave,

Yes, I am talking about GLM ANOVA.  Yes, I know that an eta square number is for each IV.  What I don’t get is in reading the descriptive material for the DV (say math scores on a placement test). There are means and standard deviations for each IV, so when eta square says that 24% of the variance of the DV is accounted for by education level (high school or college), which variance is it for: the mean and variance associated with the high school or the college group?