/���ݱ�׼��/
    proc contents data=loan.rename(drop=v_1 v_5) out=std1;run;
    proc sql noprint;
    select name into:varlist separated by ‘ ‘ from std1
    where type=1;
    quit;

    /��������ֵ�ͱ��������˱�׼������ ��׼���ķ�����mean��median��sum��std/
    proc stdize data=loan.rename out=loan.std
    method=std ;
    var &varlist.;
    run;