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arXiv 1909.05922stat.COstat.ME
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Bayes因子与替代分布混合的蒙特卡罗逼近

Monte Carlo Approximation of Bayes Factors via Mixing with Surrogate Distributions

Chenguang Dai, Jun S. Liu

摘要:

通过将目标后验分布与一个归一化常数易处理的替代分布混合,提出了一种利用Wang-Landau算法估计边缘似然的方法。我们表明,所提出的方法可以通过动量加速实现更快的收敛。详细介绍了两种实现策略:(i)通过Multiple-try Metropolis促进后验分布和代理分布之间的全局跳跃;(ii)通过变分近似构造代理。在代理难以获得的情况下,提出了一种新的一般可逆跳马尔可夫链蒙特卡罗算法的跳机制,该机制结合了多尝试Metropolis算法和方向采样算法.我们说明了几个统计模型,包括对数高斯Cox过程,贝叶斯套索,逻辑斯谛回归,和g-先验贝叶斯变量选择所提出的方法。

英文摘要:

By mixing the target posterior distribution with a surrogate distribution, of which the normalizing constant is tractable, we propose a method for estimating the marginal likelihood using the Wang-Landau algorithm. We show that a faster convergence of the proposed method can be achieved via the momentum acceleration. Two implementation strategies are detailed: (i) facilitating global jumps between the posterior and surrogate distributions via the Multiple-try Metropolis; (ii) constructing the surrogate via the variational approximation. When a surrogate is difficult to come by, we describe a new jumping mechanism for general reversible jump Markov chain Monte Carlo algorithms, which combines the Multiple-try Metropolis and a directional sampling algorithm. We illustrate the proposed methods on several statistical models, including the Log-Gaussian Cox process, the Bayesian Lasso, the logistic regression, and the g-prior Bayesian variable selection.

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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