Filter data based on macro variable values in SAS

Question

%let var_list = n1 n2 n3;

data A;
call streaminit(123);       /* set random number seed */
do i = 1 to 100;
   n1 = rand("Normal");
   n2 = rand("Normal");
   n3 = rand("Normal");
   output;
end;
run;

Suppose I want to filter a data set based on marco variable "&var_list", filtering all the data where each value in the macro variable is greater than 0. How should I write the macro？

Thanks for your help!

Answer 1

你的意思是你想找到N1，N2和N3都是正数的记录吗？

data want ;
  set have ;
  if nmiss(of n1 n2 n3)=0 and min(of n1 n2 n3)>0; 
run;

转换为使用宏变量。

%let varlist=n1 n2 n3;
data want ;
  set have ;
  if nmiss(of &varlist)=0 and min(of &varlist)>0; 
run;