Maximum Likelihood Estimation of the Survival Functions of N Stochastically Ordered Random Variables
N 个随机有序变量生存函数的极大似然估计AI 解读 ↓
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N 个随机有序变量生存函数的极大似然估计AI 解读 ↓
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Very often distributions will exist that logically should satisfy linear stochastic ordering requirements. For example, if a mechanical device is improved through N stages, the corresponding survival functions should be linearly stochastically ordered. Nevertheless, estimates may not totally reflect this stochastic ordering because of the inherent variability of the observations. Here we characterize the maximum likelihood estimates of the survival functions subject to linear stochastic ordering requirements. We show that our estimates may be expressed in terms of the well-known Kaplan—Meier product limit estimates. We also give an iterative algorithm, which we show must converge to the correct solution, that depends only on solving the pairwise problem. Finally, we consider an example concerning survival times for people with squamous carcinoma in the oropharynx when classified by degree of lymph node deterioration at time of discovery.