data one; input ID Date total predicted; cards; 1 6/24/18 200 250 1 6/30/18 200 270 1 6/18/20 200 230 2 5/24/18 160 200 2 5/27/18 160 210 2 5/22/18 160 170 3 5/20/18 300 450 3 5/14/18 300 400 3 5/4/18 300 425 ;
i want to pick the first date for each ID and subtract that date and IDs Predicted from Total
Show us the desired result.
result would look like this ID Date total Predicted diff 1 6/18/20 200 230 -30 2 5/22/18 160 170 -10 3 5/4/18 300 425 -125
The way your data is sorted you're looking for the last. Is your data sort important and verified or do you need to verify it?
proc sort data=have;
by id date;
run;
data want;
set have;
by id;
if first.id;
dif = predicted-total;
run;
Documentation references:
They have some good pictures that illustrate how BY groups work in the documentation.
@hk2013 wrote:
data one; input ID Date total predicted; cards; 1 6/24/18 200 250 1 6/30/18 200 270 1 6/18/20 200 230 2 5/24/18 160 200 2 5/27/18 160 210 2 5/22/18 160 170 3 5/20/18 300 450 3 5/14/18 300 400 3 5/4/18 300 425 ;i want to pick the first date for each ID and subtract that date and IDs Predicted from Total
This code should give you the results you want:
data two (drop=temp);
set one;
by ID;
retain temp;
if first.id then temp=total;
else if last.id then do;
diff=temp-predicted;
output;
end;
run;
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