Hello all,   I am wondering whether someone can help me with this.   I am running following macro, but always show more positional parameters found than defined and no any procedure was run;   %macro median(dsn, catvar, var, mvar); proc univariate noprint data=&dsn; where &catvar=1; var &var; output out=apctls3_1 pctlpts=50 pctlpre=p_ pctlname=p50_1; run; proc univariate noprint data=&dsn; where &catvar=2; var &var; output out=apctls3_2 pctlpts=50 pctlpre=p_ pctlname=p50_2; run; proc univariate noprint data=&dsn; where &catvar=3; var &var; output out=apctls3_3 pctlpts=50 pctlpre=p_ pctlname=p50_3; run; data median; merge apctls3_1 apctls3_2 apctls3_3; run; data _null_;set median; call symput('M1',p_p50_1); call symput('M2',p_p50_2); call symput('M3',p_p50_3); run; data &dsn; set &dsn; if &catvar=1 then &mvar=&M1; else if &catvar=2 then &mvar=&M2; else if &catvar=3 then &mvar=&M3; run; %mend median; %tertile(a1, frtsummcat3, frtsumm, frttry2);   ERROR: More positional parameters found than defined.   Thanks     ... View more