*    This is file TRIATHLT.SAS;
TITLE 'Variable selection methods for triathlete data';
DATA;
        INFILE triathlt;
        INPUT T A W E Tr Tb Ts Vr Vb Vs;
        LABEL T='time in minutes'
              A='age'
              W='weight'
              E='years experience'
              Tr='run training'
              Tb='bike training'
              Ts='swim training'
              Vr='run oxygen consumption'
              Vb='bike oxygen consumption'
              Vs='swim oxygen consumption';
proc STEPWISE;
        model T=A W E Tr Tb Ts Vr Vb Vs/STEPWISE SLENTRY=.05 SLSTAY=.05;
        model T=A W E Tr Tb Ts Vr Vb Vs/FORWARD SLENTRY=.05;
        model T=A W E Tr Tb Ts Vr Vb Vs/BACKWARD SLSTAY=.05;
        model T=A W E Tr Tb Ts Vr Vb Vs/MAXR;