arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.05105stat.MEstat.CO
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贝叶斯因子分析模型的可辨识性

On the identifiability of Bayesian factor analytic models

Panagiotis Papastamoulis, Ioannis Ntzoufras

摘要:

因子分析模型中一个众所周知的可识别性问题是关于正交变换的不变性。这个问题加重了贝叶斯设置下的推断,其中使用马尔可夫链蒙特卡罗(MCMC)方法从后验分布生成样本。我们引入了一个后处理方案,以处理旋转,符号和排列不变性的MCMC样本。贡献算法的精确版本需要在每次(保留)MCMC迭代中求解$2^q$分配问题,其中$q$表示拟合模型的因子数。对于大量的因素,两个近似方案的模拟退火的基础上进行了讨论。我们证明,所提出的方法导致可解释的后验分布使用合成和公开可用的数据,从典型的因子分析模型以及混合因子分析。一个R包可在CRAN网页上在线获得。

英文摘要:

A well known identifiability issue in factor analytic models is the invariance with respect to orthogonal transformations. This problem burdens the inference under a Bayesian setup, where Markov chain Monte Carlo (MCMC) methods are used to generate samples from the posterior distribution. We introduce a post-processing scheme in order to deal with rotation, sign and permutation invariance of the MCMC sample. The exact version of the contributed algorithm requires to solve $2^q$ assignment problems per (retained) MCMC iteration, where $q$ denotes the number of factors of the fitted model. For large numbers of factors two approximate schemes based on simulated annealing are also discussed. We demonstrate that the proposed method leads to interpretable posterior distributions using synthetic and publicly available data from typical factor analytic models as well as mixtures of factor analyzers. An R package is available online at CRAN web-page.

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