If only regression coefficient, Wald test and proba deviation given, how to calculate effect size?
If you can derive your sample size from the df of the Wald test, the number of independeent variables from the regression coefficients, The effect size will be tantamount to the Wald F^2, then you can compute the power of the model from that. Remember that your R^2 = f^2/(1 + f^2). So a small effect size = .02, a medium=.15, and a large = .35. (See Jacob Cohen, Power Analysis for the Behavioral Sciences, 2nd ed., pp.410ff.
Find a calculator that can do this, http://www.uccs.edu/~lbecker/
If you can derive your sample size from the df of the Wald test, the number of independeent variables from the regression coefficients, The effect size will be tantamount to the Wald F^2, then you can compute the power of the model from that. Remember that your R^2 = f^2/(1 + f^2). So a small effect size = .02, a medium=.15, and a large = .35. (See Jacob Cohen, Power Analysis for the Behavioral Sciences, 2nd ed., pp.410ff.
Dear all,
I like to thank everyone who have contributed to my previous questions. your help has been a tremendous support for my meta analysis.
Thank you
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