what does the partial eta squared mean
Partial eta-squared is a measure of variance, like r-squared. It tells us what proportion of the variance in the dependent variable is attributable to the factor in question. You can get these measures by choosing the 'Estimates of effect size' option when setting up an ANOVA.s mentioned above, partial eta-squared is obtained as an option when doing an ANOVA and r or R come naturally out of correlations and regressions. The only effect size you're likely to need to calculate is Cohen's d. To help you out, here are the equations.