请问:1.生存分析中,proc lifetest运行出来的结果,截尾数据对应的Survival 和Failure 是缺失值吗?
2.proc lifetest运行出来的结果,Failure 可以理解为是累计概率么?
Time to sustained progression Number (%) subjects with event 4/38 (10.5%)
Cumulative probability at month 6 5.26%
Cumulative probability at month 12 5.26%
Cumulative probability at month 18 11.41%
Cumulative probability at month 24 11.41%
Cumulative probability at month 30 11.41%
Cumulative probability at month 36 11.41%
上边的结果是用lifetest 直接运行出来的结果,后边的百分数是结果中Failure对应的数值。请问怎么解释这种结果??