Slicing a SAS datset

[niam]

Hello;

I have create a pretty large dataset which contains over a million observations over 36 months between January 2010 and January 2013. thing like this

Date	Var1	Var2
2JUL2011	1	2
5MAY2011	3	4
6DEC2012	5	6
7JAN2013	7	8

Based on a timestamp variable (say DATE) I would like to create 36 separate datasets which each of them contains only the observations that fit within 1 month. So the first dataset contains the observations in January 2011, the second dataset contains the observations in February 2011, and so on.

Would you please let me know if there is an easy way to do this or I have to write a lot of IF statements?

Thanks

[Ksharp · Accepted solution]

Hash Table:

data have;
do date='01jan2010'd to '30jan2013'd  ;
 monyy=put(date,monyy7.); var1=1;var2=1;output; output;
end;
run;
proc sort data=have;by monyy;run;


data want;
 if _n_ eq 1 then do;
  if 0 then set  have;
  declare hash ha(multidata:'y');
   ha.definekey('monyy');
   ha.definedata('date','var1','var2');
   ha.definedone();
 end;
do until(last.monyy);
 set have;
 by monyy;
 ha.add();
end;
ha.output(dataset:monyy);
ha.clear();
run;

Ksharp

Message was edited by: xia keshan  Sorry I found problem in my code.

[Scott_Mitchell]

That is a fantastic way to create dynamically named datasets.  Thanks for posting it.  I am sure this will come in handy.

[Reeza]

Generally not recommended.

http://www.sascommunity.org/wiki/Split_Data_into_Subsets

If for some reason you decide you really need to, you can create a month year variable from your date, using put(date, monyy7.)