repeat same prco using macro

[Xiaoningdemao]

Good morning!

I have a question about using macro in sas. I want to check the log-log plot for many variables(more than 10). The program is the same for each of them. So instead of have 10 same repeated programs. I want to use macro, but I don't knew how to use extract the elemnt in macro variable one by one. My code is:

%let plot= age sex hight;

%macro plot;

%do i=1 %to 10;

proc lifetest data=modeldata plot=(lls) ;

time followup*pass(0);

strata &plot[i];

ods select 'LOGLOGS Plot';

run;

%end;

%mend plot;

But it doesn't work. I feel the problem is wirh strata &plot[i];

Can you help me fix this code? Or come up with a better way to do so?

Thank you very much!!

Best wishes,

[Astounding]

You'll have to show us what the program would look like without macro language.  You only have to show the program for 1 variable, but it has to be working code.  If the code you show doesn't work for 1 variable, macro language would only generate nonworking code for 10 variables ... not a useful result.

[Tom · Accepted solution]

Macro variables are just strings, not arrays. So use some simple string processing functions.

%macro plot(varlist);
%local i;
%do i=1 %to %sysfunc(countw(&varlist));
proc lifetest data=modeldata plot=(lls) ;
time followup*pass(0);
strata %scan(&varlist,&i) ;
ods select 'LOGLOGS Plot';
run;
%end;
%mend plot;

%plot(age sex hight);
 

[Xiaoningdemao]

Dear Tom,

Thank you very much!!!
This is exactly what I want!!!

Best wishes.