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添加生存回归
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endymecy committed Jul 3, 2017
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Expand Up @@ -71,7 +71,7 @@ $$\iota(\beta,\sigma)=\sum_{i=1}^{n}[-\delta_{i}\log\sigma+\delta_{i}\log{f_{0}}

  其中$S_{0}(\epsilon_{i})$是基准生存函数,$f_{0}(\epsilon_{i})$是对应的概率密度函数。

  最常用的`AFT`模型基于生存时间的韦伯分布,生存时间的韦伯分布对应于生存时间对数的极值分布,所以$S_{0}(\epsilon)$函数为:
  最常用的`AFT`模型基于服从韦伯分布的生存时间,生存时间的韦伯分布对应于生存时间对数的极值分布,所以$S_{0}(\epsilon)$函数为:

$$S_{0}(\epsilon_{i})=\exp(-e^{\epsilon_{i}})$$

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