SAS의 sort 프로시져 이용시에 nodupkey 옵션 혹은 데이터 스텝 first.을 사용하면 됩니다.
예 1) sort 이용시
proc sort data=old out=new nodupkey;
by X Y; /* 중복되는 변수명 */
run;
예 2) first.이용시
data b;
set a;
by x;
if first.x=1;
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