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arXiv 2401.16660stat.ME
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一种在样本信息期望值高斯近似中估计有效样本量的非参数方法

A Nonparametric Approach for Estimating the Effective Sample Size in Gaussian Approximation of Expected Value of Sample Information

Linke Li, Hawre Jalal, Anna Heath

AI总结:

针对现有高斯近似框架下有效样本量(ESS)估计方法计算成本高或不准确的问题,提出一种利用生成数据集汇总统计量与非参数回归估计ESS的新方法,可低成本实现准确估计,助力高效的样本信息期望值(EVSI)计算与决策模型概率分析。

摘要:

有效样本量(ESS)以等效的研究参与者数量来衡量概率分布的信息价值。在通过高斯近似方法估计样本信息期望值(EVSI)的过程中,ESS发挥着关键作用。尽管ESS十分重要,但现有高斯近似框架内的ESS估计方法要么计算成本高昂,要么可能存在不准确的问题。为解决这些局限,我们提出了一种新方法,利用生成数据集的汇总统计量与非参数回归方法来估计ESS。仿真结果表明,所提方法能以较低的计算成本提供准确的ESS估计,是量化参数概率分布所包含信息的一种高效实用的途径。总体而言,确定ESS可帮助分析人员在决策模型的概率分析中理解复杂先验分布中的不确定性水平,并实现高效的EVSI计算。

英文摘要:

The effective sample size (ESS) measures the informational value of a probability distribution in terms of an equivalent number of study participants. The ESS plays a crucial role in estimating the Expected Value of Sample Information (EVSI) through the Gaussian approximation approach. Despite the significance of ESS, existing ESS estimation methods within the Gaussian approximation framework are either computationally expensive or potentially inaccurate. To address these limitations, we propose a novel approach that estimates the ESS using the summary statistics of generated datasets and nonparametric regression methods. The simulation results suggest that the proposed method provides accurate ESS estimates at a low computational cost, making it an efficient and practical way to quantify the information contained in the probability distribution of a parameter. Overall, determining the ESS can help analysts understand the uncertainty levels in complex prior distributions in the probability analyses of decision models and perform efficient EVSI calculations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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