这个是把NIANLING分成7个组,为什么我的运行结果总是出错
data sick;
proc freq;
table nianling;
proc capability;
histogram nianling;
run;
data s1;
set sick;
if nianling<15 then fenzu=1;
if nianling>=15 and a<25 then fenzu=2;
if nianling>=25 and a<35 then fenzu=3;
if nianling>=35 and a<45 then fenzu=4;
if nianling>=45 and a<55 then fenzu=5;
if nianling>=55 and a<65 then fenzu=6;
if nianling>=65 then fenzu=7;
run;
现实没有找到“NINGLING”