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arXiv 1607.03080stat.ME
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近似贝叶斯计算(ABC)结合贝叶斯模型平均法估计平均值和标准差

Approximate Bayesian computation (ABC) coupled with Bayesian model averaging method for estimating mean and standard deviation

Deukwoo Kwon, Isildinha M. Reis

摘要:

背景资料:我们提出了近似贝叶斯计算与单一分布选择(ABC-SD)估计平均值和标准差从其他报告的汇总统计量。ABC-SD从被认为是基础研究数据的真实分布的单个参数分布生成伪数据。该单一分布或者是有根据的猜测,或者是通过使用用于测试两个或更多个候选分布的后验概率标准的模型选择来选择的。进一步分析表明,当使用模型选择时,后验模型概率对参数的先验分布敏感,并依赖于报告的汇总统计量的类型。方法:我们提出了ABC与贝叶斯模型平均(ABC-BMA)的方法来估计平均值和标准差的基础上,在已发表的研究报告的各种其他汇总统计。我们进行了蒙特卡罗模拟研究,比较新提出的ABC-BMA方法与我们以前的ABC-SD方法。结果如下:在标准差的估计中,对于正态分布、对数正态分布、β分布和指数分布,ABC-BMA的平均相对误差(ARE)小于ABC-SD。对于韦布尔分布,在小样本量下,ABC-BMA的ARE大于ABC-SD的ARE,但小于0.05,并随着样本量的增加而趋于零。当基础分布高度偏态且可用汇总统计量仅为四分位数和样本量时,建议使用ABC-BMA,但应谨慎使用。ABC-BMA和ABC-SD之间的平均值估计的比较显示了与标准差估计相似的结果模式。结论:ABC-BMA易于实现,并且在估计均值和标准差方面优于我们以前的ABC-SD方法。

英文摘要:

Background: We proposed approximate Bayesian computation with single distribution selection (ABC-SD) for estimating mean and standard deviation from other reported summary statistics. The ABC-SD generates pseudo data from a single parametric distribution thought to be the true distribution of underlying study data. This single distribution is either an educated guess, or it is selected via model selection using posterior probability criterion for testing two or more candidate distributions. Further analysis indicated that when model selection is used, posterior model probabilities are sensitive to the prior distribution(s) for parameter(s) and dependable on the type of reported summary statistics. Method: We propose ABC with Bayesian model averaging (ABC-BMA) methodology to estimate mean and standard deviation based on various sets of other summary statistics reported in published studies. We conduct a Monte Carlo simulation study to compare the new proposed ABC-BMA method with our previous ABC-SD method. Results: In the estimation of standard deviation, ABC-BMA has smaller average relative errors (AREs) than that of ABC-SD for normal, lognormal, beta, and exponential distributions. For Weibull distribution, ARE of ABC-BMA is larger than that of ABC-SD but <0.05 in small sample sizes and moves toward zero as sample size increases. When underlying distribution is highly skewed and available summary statistics are only quartiles and sample size, ABC-BMA is recommended but it should be used with caution. Comparison of mean estimation between ABC-BMA and ABC-SD shows similar patterns of results as for standard deviation estimation. Conclusion: ABC-BMA is easy to implement and it performs even better than our previous ABC-SD method for estimation of mean and standard deviation.

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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