Testing for Sufficient Follow-Up and Outliers in Survival Data
生存数据中的充分随访与异常值检验AI 解读 ↓
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生存数据中的充分随访与异常值检验AI 解读 ↓
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A situation in which a sample of failure times with many of the largest times censored may be taken as evidence of a proportion of “immune” or “cured” individuals, who are not subject to failure, in the population. A plot of the Kaplan-Meier empirical distribution function for such data will tend to level off near its right extreme, provided that follow-up of individuals has been continued for long enough. This article develops a diagnostic test for sufficient follow-up in samples where there may or may not be immunes and demonstrates its properties. The procedure is illustrated on some criminological data, leading us also to propose a test for outliers in this kind of situation.