我做lifetest检验，编程如下，不能运行。望高手的哥哥姐姐们帮帮忙给修改一下，谢了

DATA abc;

INPUT lt @@;

IF lt<0 THEN censor=1;

ELSE group='low-wbc';

t=ABS(lt);

CARDS;

2 -2.5 3.5 4 4 -5 6 -6 7 -7 8 -9 10.5 12.5 19

2.5 5 7 -8.5 9 -10 11 -11 12 13 -14 15 -16 17 -18 19 -20 21 24 32

;

PROC LIFETEST METHOD=PL

     PLOTS=(S,LS,LLS);

TIME t*censor(1);

STRATA group;

RUN;

 

PROC LIFETEST METHOD=LIFE

                 PLOTS=(S,H);

TIME  t*censor(1);

STRATA group;

RUN;