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Eta-Square in Multiple Regression Fit Model

I am looking for the unbiased estimate of eta-sqaure in the fit model platform. Is this the same as adjusted- rSQ? -- and then if so, is this interpreted as the percetage of variability in the dependant variable that can be explained by the set of predictors used to fit the model, i.e. adjust rsq .75 = 75% of the variability in the the data is explained by my predictors?

Thanks!