Dynamic first observation: Need to put a variable in firstobs=

Question

I couldn\'t find anything on google.

I have a data set and need to iterate it in chunks, first chunk would be: firstobs = 1 obs = 30000 second chunk would be: firstobs =

Answer 1

Write a macro to do what you want.

%macro loop(max,by);
%do i=%eval(1+&by) %to &max %by &by;

data _null_;
set all_include_Stornos(firstobs=%eval(&i-&by) obs=&i);
...
run;
%end;
%mend;
%loop(90001,30000)

Edit: Realized I should explain how fisrtobs= and obs= work. Basically, it starts at record "firstobs" and ends at "obs". So you use a macro loop to go from 1 to 90001 by 30000. This way you only process 30k records at a time. You can always change the "by" value in the macro if you need to reduce the chunk size.