arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1608.08968stat.MEstat.ML
收藏

贝叶斯SLOPE

The Bayesian SLOPE

Amir Sepehri

摘要:

SLOPE通过使用排序的$\ell_1$范数惩罚最小化正则化残差平方和来估计回归系数。SLOPE结合了回归问题中的测试和估计。它具有合适的变量选择和预测属性,以及极大极小最优性。本文介绍了线性回归的贝叶斯斜率法。经典的SLOPE估计是正态回归问题中的后验模式,具有适当的系数先验。Bayesian SLOPE考虑了完整的Bayesian模型,并具有为参数提供可信集和标准误估计值的优势。此外,分层贝叶斯框架允许完整的贝叶斯和经验贝叶斯处理的惩罚系数,而目前尚不清楚如何选择这些系数时,使用的SLOPE对一般的设计矩阵。后提供了一个直接的表征,这表明吉布斯采样器,不涉及潜在变量。本文介绍了一种有效的贝叶斯斜率混合Gibbs采样器。突出显示了使用后验均值的点估计,这自动促进了对未来观测的贝叶斯预测。这些都证明了真实和合成数据。

英文摘要:

The SLOPE estimates regression coefficients by minimizing a regularized residual sum of squares using a sorted-$\ell_1$-norm penalty. The SLOPE combines testing and estimation in regression problems. It exhibits suitable variable selection and prediction properties, as well as minimax optimality. This paper introduces the Bayesian SLOPE procedure for linear regression. The classical SLOPE estimate is the posterior mode in the normal regression problem with an appropriate prior on the coefficients. The Bayesian SLOPE considers the full Bayesian model and has the advantage of offering credible sets and standard error estimates for the parameters. Moreover, the hierarchical Bayesian framework allows for full Bayesian and empirical Bayes treatment of the penalty coefficients; whereas it is not clear how to choose these coefficients when using the SLOPE on a general design matrix. A direct characterization of the posterior is provided which suggests a Gibbs sampler that does not involve latent variables. An efficient hybrid Gibbs sampler for the Bayesian SLOPE is introduced. Point estimation using the posterior mean is highlighted, which automatically facilitates the Bayesian prediction of future observations. These are demonstrated on real and synthetic data.

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。

↑