I have 3 variables, ID, order_date, and order_amount for a year, and I want to get the first 30days data starting from the first order date for each ID.
proc sort data=year_data;
by ID order_date;
run;
data first_month;
set year_data;
by ID order_date;
where day(order_date) - day(first.order_date) <=30;
run;
this does not work. There is a syntax error at day(first.order_date). What is wrong there?
that works! thank you for teaching me!
Well, you could do something like:
data first_month; set year_data; by id; retain first_date; if first.if then first_date=order_date; if first_date <= order_date <= intnx('month',first_date,1,'same') then output; run;
Note I am assuming that date is a date variable not a datetime. This will output only rows between first_date and first_date+1 month.t
Yes, it reuiqres the data to be sorted, as per the proc sort in your first post. The date does not need to be in the by line however, what I am doing is retaining the first observation for each id across the id, then using that to compare to the current observations date.
Thank you, RW9.
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