Required INPUT:
- This SAS program requires that you enter a (population) correlation matrix into the program file with the variables arranged in the order Y, X1, …, Xp.
The OUTPUT of this program includes the following information:
- The R2 values for all subset models
- The difference between R2 for the model containing [X1,X2] and the model containing [X1,X3], as well as the variance and standard deviation of this difference
- The minimum sample size required to achieve various power rates for testing the null hypothesis that the difference is zero
- The expected power rates (for testing the null hypothesis that the difference is zero) achieved with various sample sizes (from 50 to 650).
THE PROGRAM:
r2infmacro.sas (Click to download)