arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.03303stat.MEstat.APstat.CO
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qgam:R语言中的贝叶斯非参数分位数回归建模

qgam: Bayesian non-parametric quantile regression modelling in R

Matteo Fasiolo, Simon N. Wood, Margaux Zaffran, Raphaël Nedellec, Yannig Goude

摘要:

广义可加模型(GAM)是一种灵活的非线性回归模型,可以使用mgcv R软件包提供的近似贝叶斯方法有效地拟合。虽然mgcv提供的GAM方法是基于响应分布是参数化建模的假设,但在这里,我们讨论更灵活的方法,不需要任何参数假设。特别地,本文介绍了qgam包,它是mgcv的扩展,提供了用于在R中拟合分位数GAM(QGAM)的快速校准贝叶斯方法。QGAM基于Koenker(2005)的弹球损失的平滑版本,而不是基于似然函数,因此,联合实现分位数点估计的令人满意的精度和相应可信区间的覆盖需要采用Fasiolo、Wood、Zaffran、Nedellec和Goude(2020 b)的专门贝叶斯拟合框架。在这里,我们详细介绍了这个框架是如何在qgam中实现的,我们提供了一些例子来说明如何在实践中使用这个包。

英文摘要:

Generalized additive models (GAMs) are flexible non-linear regression models, which can be fitted efficiently using the approximate Bayesian methods provided by the mgcv R package. While the GAM methods provided by mgcv are based on the assumption that the response distribution is modelled parametrically, here we discuss more flexible methods that do not entail any parametric assumption. In particular, this article introduces the qgam package, which is an extension of mgcv providing fast calibrated Bayesian methods for fitting quantile GAMs (QGAMs) in R. QGAMs are based on a smooth version of the pinball loss of Koenker (2005), rather than on a likelihood function, hence jointly achieving satisfactory accuracy of the quantile point estimates and coverage of the corresponding credible intervals requires adopting the specialized Bayesian fitting framework of Fasiolo, Wood, Zaffran, Nedellec, and Goude (2020b). Here we detail how this framework is implemented in qgam and we provide examples illustrating how the package should be used in practice.

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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