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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.
Four of the commonly used measures of effect size in AVOVA are: Eta squared (h 2), partial Eta squared (h p 2), omega squared (w 2), and the Intraclass correlation (r I). Eta squared and partial Eta squared are estimates of the degree of association for the sample.t is possible for the sums of the partial Eta squared values to be greater than 1.00. In general, Eta squared values describe the amount of variance accounted for in the sample. An estimate of the amount of variance accounted for in the population is omega squared.