I am currently working with the attatched dataset called "test".
where the good and bad variables are binary.
I want to keep ONLY the groups that
- have a good flag in the first row
- have a bad flag in any row after the first row.
Also assign a string as a fourth variable that would have "Y" if they satify the above crieteria or "N" otherwise.
Many thanks.
data want(drop=one two); one=1; two=1; do until(last.id); set test; by id notsorted; if first.id and good ne 1 then one=0; if (not first.id and bad ne 1) or (first.id and last.id) then two=0; end; if one and two then flag='Y'; else flag='N'; do until(last.id); set test; by id notsorted; output; end; run;
Ksharp
You don't post ouput you want to see. So
Assuming only good or bad can be 1.(i.e. good=1 bad=0 or good=0 bad=1).
libname x v9 'c:\'; proc means data=x.test nway noprint; class id; var bad; output out=temp(drop=_type_ rename=(id=_id)) sum= /autoname; run; data want(drop=_: bad_sum); set x.test; retain flag ' '; if id ne lag(id) then do; flag='N'; if good=1 then do; do i=1 to _nobs; set temp nobs=_nobs point=i; if id=_id and _freq_=bad_sum+1 and _freq_ ne 1 then do; flag='Y'; leave;end; end; end; end; run;
Ksharp
data want(drop=one two); one=1; two=1; do until(last.id); set test; by id notsorted; if first.id and good ne 1 then one=0; if (not first.id and bad ne 1) or (first.id and last.id) then two=0; end; if one and two then flag='Y'; else flag='N'; do until(last.id); set test; by id notsorted; output; end; run;
Ksharp
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