topic Re: run many outcomes by many risk factors in SAS Programming

run many outcomes by many risk factors

antonsvart — Tue, 03 Dec 2019 20:30:31 GMT

Hello,

I'm looking to conduct chi square tests for 9 outcome variables each by 29 potential risk factors (i.e., outcome #1 by risk factor #1, then risk factor #2, etc., then outcome #2 by risk factor #1 then risk factor #2, etc.).

So far, I've conceived this piece of code, but I'm not sure how to execute it without somehow attaching numbers to my outcomes and to my risk factors.



%do i=1 to &outcome_&i;
%do j=1 to &rf_&j;
		proc freq data=myData ;
	        table &outcome_&i*&rf_&j/chisq;
		run;
%end; /*end risk factor loop*/
%end; /*end outcome loop*/

Thank you for your help.

Re: run many outcomes by many risk factors

Reeza — Tue, 03 Dec 2019 20:38:02 GMT

Don't think you need macros. I think you need one to be a BY statement instead.

It'll depend a bit on your table structure, which you may need to change but you don't need macros for this.

Re: run many outcomes by many risk factors

antonsvart — Tue, 03 Dec 2019 20:54:52 GMT

Not sure that by statement in proc freq would work here - wouldn't it generate chi square tests per every level of the by variable? I'd need just one chisq per outcome*risk factor combination.

Re: run many outcomes by many risk factors

ballardw — Tue, 03 Dec 2019 21:16:59 GMT

Try

proc freq data=myData ;
   table <list of outcome variables * <list of risk variables>j/chisq;
   run;

When you use a tables statement like

Tables (a b c) * (x y z) you get results for all of the pairs: a*x a*y a*z b*x b*y b*z c*x c*y c*z.

Re: run many outcomes by many risk factors

Reeza — Tue, 03 Dec 2019 21:38:49 GMT

Depends on your data structure. I'm assuming you have a structure something like the following:

riskfactor outcome result
1               1            8
1                1           4
....

Restructuring your data is also pretty straightforward to get this which then helps facilitate a lot of further analysis quite easily.

Tidy data rules should be followed, in general, it saves you time overall.