Optimal sampling ratios in comparative diagnostic trials.

Optimal sampling ratios in comparative diagnostic trials.
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比较诊断试验中的最佳采样率。

DOI:
10.1111/rssc.12043
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发表时间:
2014
期刊:
Journal of the Royal Statistical Society. Series C, Applied statistics
影响因子:
--
通讯作者:
Rosenberger,WilliamF
Rosenberger,WilliamF
中科院分区:
--
文献类型:
--
作者:
Dong,Ting;Tang,LianshengLarry;Rosenberger,WilliamF

文献摘要

相似文献

在比较诊断试验中,病例和对照组之间的主观抽样率并不总是最大化力量或最小化所需总样本量的有效选择。基于接收机工作特性曲线的几个现有汇总统计量所共有的共同方差结构,我们推导出了最优采样率的显式表达式。我们提出了一种两阶段的过程,在没有导频数据的情况下自适应地估计最优比率。我们通过理论证明、广泛的模拟研究和癌症诊断研究中的一个实例来研究所提出的方法的特性。
A subjective sampling ratio between the case and the control groups is not always an efficient choice to maximize the power or to minimize the total required sample size in comparative diagnostic trials. We derive explicit expressions for an optimal sampling ratio based on a common variance structure shared by several existing summary statistics of the receiver operating characteristic curve. We propose a two-stage procedure to estimate adaptively the optimal ratio without pilot data. We investigate the properties of the proposed method through theoretical proofs, extensive simulation studies and a real example in cancer diagnostic studies.