https://wenku.baidu.com/view/2785ff37b4360b4c2e3f5727a5e9856a561226c9.html
如果不稳定,也就是说,数据根本不稳定,那还预测个屁
Survival analysis is a branch of statistics for analyzing the expected duration of time until one event occurs, such as death in biological organisms and failure in mechanical systems.
生存分析是统计学的一个分支,用于分析一个事件发生之前的预期持续时间,例如生物有机体死亡和机械系统故障。
###### 生存分析 ######
# 第一步:创建生存对象
surv.obj <- Surv(time = ovarian$futime, event = ovarian$fustat)
surv.obj
18251844951
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https://spssau.com/helps/medicalmethod/kendall.html
https://www.zhihu.com/question/24322044/answer/2083632607