Hi,
I have data that look like this.
id date
1 1/1/2001
1 1/1/2001
1 1/2/2002
1 1/2/2002
1 1/2/2003
1 1/2/2003
2 1/1/2005
2 1/1/2005
2 1/1/2005
2 1/2/2005
2 1/2/2005
2 1/3/2006
2 1/3/2006
How do I count by id and then by date? like so
id date count
1 1/1/2001 1
1 1/1/2001 1
1 1/2/2002 2
1 1/2/2002 2
1 1/2/2003 3
1 1/2/2003 3
2 1/1/2005 1
2 1/1/2005 1
2 1/1/2005 1
2 1/2/2005 2
2 1/2/2005 2
2 1/3/2006 3
2 1/3/2006 3
so it counts every new date within the id but starts over at 1 for every new id? I tried the following but to no avail.
data work.a;
by id;
if first.id then count=0;
if count=0 then do;
fdate=date;
count+1;
end;
edate=date;
diff=edate=fdate;
if diff>0 then count+1;
run;
Thanks!
Untested - but should work. Using "count+1" implicitly makes count a retained variable.
data work.a;
by id date;
if first.id then count=1;
else if first.date then count+1;
run;
Untested - but should work. Using "count+1" implicitly makes count a retained variable.
data work.a;
by id date;
if first.id then count=1;
else if first.date then count+1;
run;
Hi Patrick,
Thank you. It works. I can now use the properties of count to manipulate the observations.
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