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关注这篇论文的作者
Shivam
Nil Kamal Hazra

多阶段抽样设计下的极端总体选择及其应用

研究问题
多个总体的评价指标未知且最优或最差总体与其他总体充分分离时,如何在多阶段抽样中以指定置信水平选出极端总体?
方法与思路
作者以广义矩方法估计总体指标,构建在线与多臂老虎机两类序贯选择算法,并在非参数分布设定下分析正确选择保证。
材料陈述的贡献
摘要称两类算法在适当条件下达到目标置信水平,并以基尼系数模拟、肿瘤突变负荷数据和异常总体识别展示框架。
阅读关注点
核对极端总体的分离要求、抽样设计与 GMM 估计、序贯停止准则,以及置信保证和异常总体存在条件的关系。
阅读边界
这是 arXiv 预印本,同行评审及期刊接收未核实;摘要未给出分离阈值、完整正则条件或样本成本,不能推断任意总体均可可靠区分。

原文摘要

We study the problem of selecting the extreme (best or worst) population from among $K(\geq 2)$ populations, under the assumption that the extreme population is sufficiently separated from the nearest population. The selection is based on an appropriate measure, which may vary across different application domains. Since the actual value of the measure is unknown, we obtain its estimator using the generalized method of moments under a multistage sampling design. Using this estimator, we propose two sequential procedures, namely online algorithm and multi armed bandit based algorithm. Under suitable regularity conditions and without imposing parametric assumptions on the underlying distributions, both algorithms correctly identify the extreme population with a desired level of confidence. We illustrate the proposed algorithms through applications in econometrics and genetics. In the econometric application, the extreme population is selected using the Gini index as a measure of inequality and the performance of the proposed procedures is assessed through extensive Monte Carlo simulation studies conducted under various distributional settings. In the genetics application, the worst population is identified using a measure derived from the tumor mutation burden (TMB) score and the practical applicability of the proposed algorithms is demonstrated using the Memorial Sloan Kettering-IMPACT 50000 clinical sequencing cohort. Further, we use the proposed framework to identify an anomalous population, provided such a population exists.

笔记与分组