Confidence bands for a survival curve from censored data
删失数据下生存曲线的置信带AI 解读 ↓
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删失数据下生存曲线的置信带AI 解读 ↓
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For arbitrarily right-censored data, the Kaplan-Meier product-limit estimator Ŝ 0N provides a nonparametric estimate of the survival function S 0 = 1 − F 0 . We provide large-sample simultaneous confidence bands for S 0 , centred at Ŝ 0N . The derivation uses the weak convergence of N½ { Ŝ 0N ( t ) − S 0 ( t )}, on a finite interval, to a Gaussian process, a theorem of Breslow & Crowley (1974), and transforms both the time and space axes of the limiting process to achieve a Brownian bridge limit. Parameters in the transformation are replaced by uniformly consistent estimates to form the bands. The new bands reduce to the well-known Kolmogorov bands in the absence of censoring. Comparisons are made with recent bands of Gillespie & Fisher (1979) and V. N. Nair. The bands are illustrated by imposing some different kinds of random censorship on a set of uncensored data.