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arXiv 2209.08159stat.MEstat.APstat.CO
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基于重复测量设计中汇总统计量计算解析 Bayes 因子

Computing analytic Bayes factors from summary statistics in repeated-measures designs

Thomas J. Faulkenberry, Keelyn B. Brennan

AI总结:

本文提出一种重复测量设计下的解析 Bayes 因子公式,仅需 F 统计量与自由度即可由最少汇总统计量评估证据,并通过模拟验证其优于 BIC 等方法。

摘要:

Bayes 因子正日益成为衡量实验证据的流行工具。对于两个相互竞争的总体模型,Bayes 因子反映了在一个模型下观测到某些数据相对于另一个模型的相对似然。一般而言,计算 Bayes 因子并不容易,因为计算每个模型的边际似然需要对似然与总体参数先验分布的乘积进行积分。本文提出了一种新的解析公式,可在重复测量设计中直接由最少的汇总统计量计算 Bayes 因子。这项工作改进了以往由汇总统计量计算 Bayes 因子的方法(例如 BIC 方法),这些方法在样本量较小时产生的 Bayes 因子会违反 Sellke 证据上界。本文采用的新方法只需知道 F 统计量和自由度,而这两者在大多数实证研究中通常都会报告。除提供计算示例外,我们还报告了一项模拟研究,将新公式与重复测量设计中其他计算 Bayes 因子的方法进行基准比较。我们的新方法为研究人员提供了一种简便途径,使其能够直接由最少的汇总统计量计算 Bayes 因子,从而让用户能够衡量其自身数据以及已发表研究中所报告数据的证据价值。

英文摘要:

Bayes factors are an increasingly popular tool for indexing evidence from experiments. For two competing population models, the Bayes factor reflects the relative likelihood of observing some data under one model compared to the other. In general, computing a Bayes factor is difficult, because computing the marginal likelihood of each model requires integrating the product of the likelihood and a prior distribution on the population parameter(s). In this paper, we develop a new analytic formula for computing Bayes factors directly from minimal summary statistics in repeated-measures designs. This work is an improvement on previous methods for computing Bayes factors from summary statistics (e.g., the BIC method), which produce Bayes factors that violate the Sellke upper bound of evidence for smaller sample sizes. The new approach taken in this paper extends requires knowing only the $F$-statistic and degrees of freedom, both of which are commonly reported in most empirical work. In addition to providing computational examples, we report a simulation study that benchmarks the new formula against other methods for computing Bayes factors in repeated-measures designs. Our new method provides an easy way for researchers to compute Bayes factors directly from a minimal set of summary statistics, allowing users to index the evidential value of their own data, as well as data reported in published studies.

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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