Hi All, I have a data that looks something like this:
Group Year Frequency
A 2010 5
A 2010 5
A 2010 5
B 2012 6
B 2012 6
B 2012 6
C 1999 1
C 1999 1
My question is, how do i remove duplicates so that it looks like this:
Group Year Frequency
A 2010 5
B 2012 6
C 1999 1
Thank You.
Well, there are numerous methods that are cut for this kind of task:
1. Proc sort:
proc sort data=have out=want nodup;
by _all_;
run;
2. Proc SQL:
proc sql;
create table want as
select distinct * from have; quit;
3. First.var and Last.var.
data want;
set have;
by id notsorted;
if first.id;
run;
4. Hash(), given the question you have asked, I would recommend you get to know the first three options before trying to tackle hash()
Regards,
Haikuo
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