hello
I have been searching the solution a while, but I couldn't find solutions in SAS in communities.
i want to make cumulative sum by group on different conditions.
the following data is raw data. it's about patient's medical utilization.
id date surgery_YN
1 2002/01/28 0
1 2002/02/15 0
1 2002/04/06 0
1 2002/06/07 1
1 2002/08/10 0
1 2003/01/12 0
2 2003/01/15 0
2 2003/02/10 1
2 2003/03/10 0
2 2003/04/08 0
i want calculate how many times patient visited clinics before he had surgery. so i want make data like this.
id date surgery_YN count
1 2002/01/28 0 1
1 2002/02/15 0 2
1 2002/04/06 0 3
1 2002/06/07 1 0
1 2002/08/10 0 0
1 2003/01/12 0 0
2 2003/01/15 0 1
2 2003/02/10 0 2
2 2003/03/10 1 0
2 2003/04/08 0 0
i used 'retain' code and i can make count '0' after surgery. but i don't know how to make cumulative sum before surgery. I wonder if anyone can help me a little bit. Thank you very much for your help!
data have;
input id date $10. surgery_YN;
cards;
1 2002/01/28 0
1 2002/02/15 0
1 2002/04/06 0
1 2002/06/07 1
1 2002/08/10 0
1 2003/01/12 0
2 2003/01/15 0
2 2003/02/10 1
2 2003/03/10 0
2 2003/04/08 0
;
proc sort data=have;
by id date;
run;
data want;
retain had_surgery;
set have;
by Id date;
if first.id then
do;
had_surgery = 0;
count = 0;
end;
if surgery_yn = 0 and had_surgery = 0 then count+1;
else if surgery_yn = 1 then
do;
had_surgery = 1;
count=0 ;
end;
run;
data want;
set have;
count+1;
if surgery = 1 then count=0;
run;
Try something like this.
Disregard...I see what you're looking for is a little different. Try this.
data want (drop=had_surgery);
set have;
retain had_surgery;
by id;
count+1;
if surgery = 1 then do;
count=0;
had_surgery=1;
end;
if had_surgery=1 then count=0;
if last.id then had_surgery=0;
run;
data have;
input id date $10. surgery_YN;
cards;
1 2002/01/28 0
1 2002/02/15 0
1 2002/04/06 0
1 2002/06/07 1
1 2002/08/10 0
1 2003/01/12 0
2 2003/01/15 0
2 2003/02/10 1
2 2003/03/10 0
2 2003/04/08 0
;
proc sort data=have;
by id date;
run;
data want;
retain had_surgery;
set have;
by Id date;
if first.id then
do;
had_surgery = 0;
count = 0;
end;
if surgery_yn = 0 and had_surgery = 0 then count+1;
else if surgery_yn = 1 then
do;
had_surgery = 1;
count=0 ;
end;
run;
data have;
input id date $10. surgery_YN;
cards;
1 2002/01/28 0
1 2002/02/15 0
1 2002/04/06 0
1 2002/06/07 1
1 2002/08/10 0
1 2003/01/12 0
2 2003/01/15 0
2 2003/02/10 1
2 2003/03/10 0
2 2003/04/08 0
;
data temp;
set have;
by id surgery_YN notsorted;
if first.id then n=0;
n+first.surgery_YN;
run;
data want;
set temp;
by n notsorted;
if first.n then count=0;
count+1;
if n ne 1 then count=0;
drop n;
run;
Just for fun, second way:
data want;
set have;
by id;
retain found;
if first.id then do;found=0;count=0;end;
count+1;
if surgery_YN=1 then found=1;
if found then count=0;
drop found;
run;
thank you for all advice.
to bobpep212, it worked out cumulative before surgery, but it didn't seperated by group. thank you for advice and correcting community group.
to VDD, I Intentionally make 'visiting data(billing data)' brief, and i think i made some error. but it worked out right. i really appreciate that.
for Ksharp, I tried VDD's code first. and he or she posted before your code. sorry for not trying your code.
Sorry too late ,but my contrib
data have;
input id date : yymmdd10. surgery_YN;
format date yymmdd10.;
cards;
1 2002/01/28 0
1 2002/02/15 0
1 2002/04/06 0
1 2002/06/07 1
1 2002/08/10 0
1 2003/01/12 0
2 2003/01/15 0
2 2003/02/10 0
2 2003/03/10 1
2 2003/04/08 0
;
data want;
set have;
by id date;
if first.id then do;f=0;count=0;end;
f+surgery_YN;
if f<1 then count+1;else count=0;
drop f;
run;
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