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This macro gives you the variable name of the maximum or minimum value across an observation.

The macro contains 3 parameters:

---

These sample files and code examples are provided by SAS Institute Inc. "as is" without warranty of any kind, either express or implied, including but not limited to the implied warranties of merchantability and fitness for a particular purpose. Recipients acknowledge and agree that SAS Institute shall not be liable for any damages whatsoever arising out of their use of this material. In addition, SAS Institute will provide no support for the materials contained herein.

/** Sample data set **/
data one;                                                                                                                               
input a b c d e;                                                                                                                        
cards;                                                                                                                                  
1 3 12 6 15                                                                                                                             
34 583 294 493 2                                                                                                                        
;                                                                                                                                       
                                                                                                                                        
%macro test(dsn,vars,func);                                                                                                             
data new;                                                                                                                  
 set &dsn;                                                                                                                              
  array list(*) &vars;                                                                                                                  
  &func = vname(list[whichn(&func(of list[*]), of list[*])]);                                                                          
run;                                                                                                                                    
%mend test; 
 
/** retrieve maximum value from a b and c **/                                                                                                                                    
%test(one,a b c,max)                                                                                                                    
                                                                                                                                        
proc print;                                                                                                                             
run;                                                                                                                                    

/** retrieve maximum value from all numeric variables **/                                                                                                                                        
%test(one,_numeric_,max)                                                                                                                
                                                                                                                                        
proc print;                                                                                                                             
run;   

---

These sample files and code examples are provided by SAS Institute Inc. "as is" without warranty of any kind, either express or implied, including but not limited to the implied warranties of merchantability and fitness for a particular purpose. Recipients acknowledge and agree that SAS Institute shall not be liable for any damages whatsoever arising out of their use of this material. In addition, SAS Institute will provide no support for the materials contained herein.

/** First PROC PRINT **/
Obs     a      b     c       d     e    max

 1      1      3     12      6    15     c
 2     34    583    294    493     2     b


/** Second PROC PRINT **/
Obs     a      b     c       d     e    max

 1      1      3     12      6    15     e
 2     34    583    294    493     2     b

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