Please I need help....
I have one years' worth of data, I want to flag any ID that occurs more than 1 in any 6-month period from the date on the row of that ID
Have
ID Date
123 1/1/15
456 2/2/15
123 2/20/15
. .
. .
. .
Want
ID Count
123 2
.
.
.
Thank you!
data have;
input ID Date: mmddyy10.;
cards;
123 1/1/15
456 2/2/15
123 2/20/15
;
proc sort data=have;
by id date;
run;
data want;
set have;
by id date;
if first.id then count=1;
else count+1;
if last.id;
run;
Group by every observation (ID, date) in a proc SQL self join :
proc sql;
select a.id, a.date, 1 + count(b.id) as count
from have as a inner join have as b on a.id=b.id and
b.date > a.date and intck("MONTH", a.date, b.date, "C") < 6
group by a.id, a.date;
quit;
I don't understand what you mean.
You mean ID must have 2-6 month data ?
What if a ID have two or more obs in one month ?
data have;
input ID Date : mmddyy10.;
format date mmddyy10.;
cards;
123 1/1/15
456 2/2/15
123 2/20/15
;
run;
proc sql;
create table want as
select id,count(*) as n
from have
group by id having count(distinct month(date)) between 2 and 6;
quit;
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