举例: 某肿瘤， 患者结局有2种情况： 死亡 c=1,   患者退出试验、试验结束时仍存活、违背试验方案退出 c=0 即为删失；T为生存时间

proc phreg data=
   model t*c(0)= sex agegrp smoke /selection=stepwise ;
run;



Survival data, therefore, are described by values of a pair of random variables, say (T, D). They can
be interpreted as follows:
• T represents the time that the subject was observed on study.
• D is an indicator of the fact that the event in question either occurred or did not occur at the
end of time T. The values of D might be 0 to indicate that the event did not occur and 1 to
indicate that it did. Then D = 0 means that the corresponding T is a censored time. Of
course, other values are possible.


资料参考：
1. https://blog.csdn.net/jaen_tail/article/details/79081954

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