Hi, I am not sure if this question has been asked, and I am new to SAS, so any help would be appriciated.
I have a table like the following:
ID Value
1 0
1 100
1 200
1 0
2 0
2 0
2 0
2 100
2 0
3 0
3 100
3 200
And I would like to create a flag for the first non-zero values for each ID. The resulting table will be:
ID Value Flag
1 0 0
1 100 1
1 200 0
1 0 0
2 0 0
2 0 0
2 0 0
2 100 1
2 0 0
3 0 0
3 100 1
3 200 0
Note that the observations are already sorted by ID and then Date, so I don't want to change the order of the observations. Is there any easier way to do this? Thank you so much!
data have;
input ID Value;
cards;
1 0
1 100
1 200
1 0
2 0
2 0
2 0
2 100
2 0
3 0
3 100
3 200
;
run;
data want;
set have;
by id;
if first.id then n=0;
if value ne 0 then n+1;
flag=ifn(n=1 and value ne 0,1,0);
drop n;
run;
data have;
input ID Value;
cards;
1 0
1 100
1 200
1 0
2 0
2 0
2 0
2 100
2 0
3 0
3 100
3 200
;
run;
data want;
set have;
by id;
if first.id then n=0;
if value ne 0 then n+1;
flag=ifn(n=1 and value ne 0,1,0);
drop n;
run;
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