Hi all,
I had this situation where I need to exclude all the ID's with history is 1 on the first observation. For example, in the below scenario there are multiple observations for each ID. I want to delete all those ID's which had history of disease (=1) on the first observation.
Data I have
ID | Order of occurrence | History |
1 | 1 | 1 |
1 | 2 | 1 |
1 | 3 | 1 |
2 | 1 | 1 |
3 | 1 | 0 |
3 | 2 | 1 |
4 | 1 | 0 |
5 | 1 | 0 |
5 | 2 | 1 |
Data i want to keep
ID | Order of occurrence | History |
3 | 1 | 0 |
3 | 2 | 1 |
4 | 1 | 0 |
5 | 1 | 0 |
5 | 2 | 1 |
I tried so many time but i can't get the result I want. Please help me. Thanks in advance for the support.
Assuming your data are already sorted properly, try this:
data have;
input ID Order_of_occurrence History;
cards;
1 1 1
1 2 1
1 3 1
2 1 1
3 1 0
3 2 1
4 1 0
5 1 0
5 2 1
;
run;
data want;
do until(last.ID);
set have;
by ID;
if first.ID = history then _N_ = 0;
if _N_ then output;
end;
run;
Bart
Assuming your data are already sorted properly, try this:
data have;
input ID Order_of_occurrence History;
cards;
1 1 1
1 2 1
1 3 1
2 1 1
3 1 0
3 2 1
4 1 0
5 1 0
5 2 1
;
run;
data want;
do until(last.ID);
set have;
by ID;
if first.ID = history then _N_ = 0;
if _N_ then output;
end;
run;
Bart
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