To do a best subsets regressionmain topic see also
To do a best subsets regression1 Choose Stat > Regression > Regression > Best Subsets.
2 In Response, enter the numeric column containing the response (Y) data.
3 In Free predictors, enter from 1 to 31 numeric columns containing the candidate predictor (X) variables.
4 If you like, use one or more of the dialog box options, then click OK.