ID season gasyear recordno
2401562901 Summer 19/20 1
2401562901 Winter 19/20 2
2401564310 Summer 19/20 1
2401564310 Summer 19/20 2
2402213802 Summer 19/20 1
2402213802 Summer 19/20 2
2402412909 Summer 19/20 1
2402412909 Summer 19/20 2
2416061809 Winter 19/20 1
2416061809 Summer 18/19 2
Hi,
I want to create a column based on the following rules:
it needs to look at each unique ID (there are only 2 rows per id).
is the season for record 1 'Summer' and season for record 2 'Summer'
and are the gasyear for record 1 and record 2 the same
if so it would give a flag 'Y' else 'N'
I have tried coding a few options and they don't work
i tired the lag function but it doesn't work when going on to a new id
thanks
data want;
merge have(where=(recordno=1)) have(where=(recordno=2)
rename=(season=season2 gasyear=gasyear2));
by id;
if season='Summer' and season2='Summer' and gasyear=gasyear2 then flag=1;
else flag=0;
run;
Assumes the input data is properly sorted by ID, and that there really are only two records per ID.
It can be done with do until() loops:
data want;
flag = "Y";
do until(last.ID);
set have; by ID;
if season ne "Summer" then flag = "N";
if missing(gy) then gy = gasyear;
else if gy ne gasyear then flag = "N";
end;
do until(last.ID);
set have; by ID;
output;
end;
drop gy;
run;
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