I have ned_1 which is a binary variable if
boardid year ned_1
1 2000 0
1 2000 1
1 2001 1
1 2001 1
1 2002 0
1 2002 0
2 2000 0
2 2000 0
2 2001 1
3 2002 1
3 2002 1
i want to arrive at
boardid year ned_1
1 2000 1
1 2001 2
1 2002 0
2 2000 0
2 2001 1
3 2002 2
how may i do this? thank you in advance!
proc sql;
select boardid, year, sum(ned_1=1) as ned_1 from have
group by boardid, year
;
quit;
Not tested.
Haikuo
I would use proc summary:
proc summary data=have;
var ned_1;
by boardid year;
output out=want (drop=_:) sum=;
run;
It helps to provide the logic, so we don't have to make assumptions.
Assuming ned_1 in your want table is the sum of the ned_1 in the first table.
Look into proc means to summarize your information.
proc sql;
select boardid, year, sum(ned_1=1) as ned_1 from have
group by boardid, year
;
quit;
Not tested.
Haikuo
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