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arXiv 2001.08327stat.MEstat.COstat.ML
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倒易贝叶斯LASSO

The Reciprocal Bayesian LASSO

Himel Mallick, Rahim Alhamzawi, Erina Paul, Vladimir Svetnik

摘要:

与对系数使用递增惩罚的传统惩罚方法相反,倒数LASSO(rLASSO)正则化采用递减惩罚函数,从而导致相对于传统收缩方法更强的简约性和更优的模型选择。在这里,我们考虑一个完全贝叶斯制定的rLASSO问题,这是基于观察的rLASSO估计线性回归参数可以被解释为贝叶斯后验模式估计时,回归参数被分配独立的逆拉普拉斯先验。贝叶斯推断从这个后验是可能的,使用扩展的层次结构的双重帕累托或截断正态分布的规模混合的动机。在模拟和真实的数据集上,我们表明贝叶斯公式在广泛的场景中在估计,预测和变量选择方面优于其经典表弟,同时提供后验推理的优势。最后,我们讨论了这种新方法的其他变体,并提供了一个统一的框架,使用灵活的倒数惩罚变量选择。本文中描述的所有方法都可以作为R包在https://github.com/himelmallick/BayesRecipe上公开获得。

英文摘要:

A reciprocal LASSO (rLASSO) regularization employs a decreasing penalty function as opposed to conventional penalization approaches that use increasing penalties on the coefficients, leading to stronger parsimony and superior model selection relative to traditional shrinkage methods. Here we consider a fully Bayesian formulation of the rLASSO problem, which is based on the observation that the rLASSO estimate for linear regression parameters can be interpreted as a Bayesian posterior mode estimate when the regression parameters are assigned independent inverse Laplace priors. Bayesian inference from this posterior is possible using an expanded hierarchy motivated by a scale mixture of double Pareto or truncated normal distributions. On simulated and real datasets, we show that the Bayesian formulation outperforms its classical cousin in estimation, prediction, and variable selection across a wide range of scenarios while offering the advantage of posterior inference. Finally, we discuss other variants of this new approach and provide a unified framework for variable selection using flexible reciprocal penalties. All methods described in this paper are publicly available as an R package at: https://github.com/himelmallick/BayesRecipe.

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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