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arXiv 2103.00808stat.ME
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极端分位数回归的梯度提升

Gradient boosting for extreme quantile regression

Jasper Velthoen, Clément Dombry, Juan-Juan Cai, Sebastian Engelke

摘要:

极端分位数回归提供数据范围外的条件分位数的估计值。经典的分位数回归在这种情况下表现不佳,因为尾部区域的数据太少。极值理论用于超出观测值范围的外推和条件极值分位数的估计。基于超阈值峰值法,将高阈值以上的条件分布近似为协变量相关参数的广义Pareto分布.我们提出了一个梯度提升过程来估计一个条件广义Pareto分布,通过最小化其偏差。交叉验证用于选择调优参数,如树的数量和树的深度。我们讨论诊断图,如变量的重要性和部分依赖图,这有助于解释拟合模型。在模拟研究中,我们表明,我们的梯度提升过程优于经典的方法,从分位数回归和极值理论,特别是对于高维预测空间和复杂的参数响应曲面。在荷兰的降水数据的天气预报的统计后处理的应用程序。

英文摘要:

Extreme quantile regression provides estimates of conditional quantiles outside the range of the data. Classical quantile regression performs poorly in such cases since data in the tail region are too scarce. Extreme value theory is used for extrapolation beyond the range of observed values and estimation of conditional extreme quantiles. Based on the peaks-over-threshold approach, the conditional distribution above a high threshold is approximated by a generalized Pareto distribution with covariate dependent parameters. We propose a gradient boosting procedure to estimate a conditional generalized Pareto distribution by minimizing its deviance. Cross-validation is used for the choice of tuning parameters such as the number of trees and the tree depths. We discuss diagnostic plots such as variable importance and partial dependence plots, which help to interpret the fitted models. In simulation studies we show that our gradient boosting procedure outperforms classical methods from quantile regression and extreme value theory, especially for high-dimensional predictor spaces and complex parameter response surfaces. An application to statistical post-processing of weather forecasts with precipitation data in the Netherlands is proposed.

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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