我的cox模型生成的风险回归函数有个转折点（下图）。。。我还能用普通cox吗？

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我的cox模型生成的风险回归函数有个转折点（下图）。。。我还能用普通cox吗？普通cox的前提，不是模型风险不随时间改变吗？若是如图所示，算不算模型风险随时间改变？？。。。
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关键词：cox模型 Cox 转折点 如图所示 模型 转折点

风险函数相关知识（来自wiki）：
最后一个自然段说：“Thus, for an exponential failure distribution, the hazard rate is a constant with respect to time (that is, the distribution is "memory-less"). For other distributions, such as a Weibull distribution or alog-normal distribution, the hazard function may not be constant with respect to time. For some such as the deterministic distribution it is monotonic increasing (analogous to "wearing out"), for others such as the Pareto distribution it is monotonic decreasing 。。。

生存数据算Pareto distribution吗？。。。。

The Pareto distribution, named after the Italian civil engineer,economist, and sociologist Vilfredo Pareto, is a power lawprobability distribution that is used in description of social,scientific, geophysical, actuarial, and many other types of observable phenomena.（From Wikipedia）

Pareto Type I probability density functions for various α with

xm

= 1. As α → ∞ the distribution approaches δ(

x

−

xm

) where δ is the

Dirac delta function

.