然后用下面的代码...
- %macro trial(n);
- %do i=1 %to &n.;
- data trial&i.;
- set trial&i.;
- format drug_Date mmddyy10.;
- age=2011-birth_year;
- if drug_type=' ' then drug='N';
- else drug='Y';
- drug_time=intck('year',drug_Date,today());
- if drug_time=. then drug_time=0;
- run;
- %end;
- %mend;
- %trial(10);