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arXiv 1409.7672stat.MEstat.ML
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贝叶斯因子分析中的序不变先验规范

Order-invariant prior specification in Bayesian factor analysis

Dennis Leung, Mathias Drton

摘要:

在(探索性)因子分析中,载荷矩阵仅确定为正交旋转。为了可识别性,人们因此经常将载荷矩阵取为具有正对角元素的下三角形。在贝叶斯推断中,标准的做法是指定一个先验,在该先验下载荷是独立的,非对角载荷是正态分布的,对角载荷遵循截断的正态分布。然而,这种先前的规范在很大程度上取决于加载矩阵的变量和相关联的行如何排序。我们展示了如何一个小的修改的方法允许一个计算与可识别的下三角加载矩阵,但保持不变的属性下重新排序的变量。

英文摘要:

In (exploratory) factor analysis, the loading matrix is identified only up to orthogonal rotation. For identifiability, one thus often takes the loading matrix to be lower triangular with positive diagonal entries. In Bayesian inference, a standard practice is then to specify a prior under which the loadings are independent, the off-diagonal loadings are normally distributed, and the diagonal loadings follow a truncated normal distribution. This prior specification, however, depends in an important way on how the variables and associated rows of the loading matrix are ordered. We show how a minor modification of the approach allows one to compute with the identifiable lower triangular loading matrix but maintain invariance properties under reordering of the variables.

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