DM 'CLEAR LOG';
DM 'CLEAR OUTPUT';
OPTIONS LINESIZE=72 NODATE NONUMBER;
LIBNAME LIBRARY 'a:\';
PROC SORT DATA=LIBRARY.pulse;
          BY gender;
PROC MEANS;
     VAR pulse1;
     BY gender;
PROC SORT;
     BY gender activity;
PROC MEANS;
     VAR pulse1;
     BY gender activity;
RUN;