arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1809.05935stat.ME
收藏

贝叶斯模块化和多尺度回归

Bayesian Modular and Multiscale Regression

Michele Peruzzi, David B. Dunson

摘要:

我们解决的问题,多尺度回归的预测,空间或时间索引,或与预先指定的多尺度结构,与贝叶斯模块化方法。最细尺度下的回归函数表示为粗阶跃函数到细阶跃函数的加法扩展。我们的模块化和多尺度(M&M)方法提供了从非常精细的测量所产生的高维数据的多尺度分解。与更复杂的方法功能预测,我们的方法提供了简单的解释的结果。此外,它还提供了数据分辨率的不确定性量化,解决了研究人员在下采样数据的简单模型中遇到的常见问题。我们表明,我们的模块化和多尺度后验具有经验贝叶斯解释,在大样本中具有简单的极限分布。一个有效的采样算法的后验计算,并说明了该方法通过模拟研究和脑图像分类的应用。源代码可以在https://github.com/mkln/bmms上以R包的形式获得。

英文摘要:

We tackle the problem of multiscale regression for predictors that are spatially or temporally indexed, or with a pre-specified multiscale structure, with a Bayesian modular approach. The regression function at the finest scale is expressed as an additive expansion of coarse to fine step functions. Our Modular and Multiscale (M&M) methodology provides multiscale decomposition of high-dimensional data arising from very fine measurements. Unlike more complex methods for functional predictors, our approach provides easy interpretation of the results. Additionally, it provides a quantification of uncertainty on the data resolution, solving a common problem researchers encounter with simple models on down-sampled data. We show that our modular and multiscale posterior has an empirical Bayes interpretation, with a simple limiting distribution in large samples. An efficient sampling algorithm is developed for posterior computation, and the methods are illustrated through simulation studies and an application to brain image classification. Source code is available as an R package at https://github.com/mkln/bmms.

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。

↑