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arXiv 1901.06211stat.ME
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有界结果建模的随机森林方法

A Random Forest Approach for Modeling Bounded Outcomes

Leonie Weinhold, Matthias Schmid, Marvin N. Wright, Moritz Berger

摘要:

随机森林已成为一种既定的分类和回归工具,特别是在高维环境中,并在复杂的预测响应关系的存在。然而,对于受限于单位区间的有界结果变量,经典的随机森林方法可能会受到严重影响,因为它们没有考虑数据中的异方差性。提出了一种将贝塔分布结果与解释变量相关联的随机森林方法。该方法明确地利用β分布的似然函数在树的建立过程中选择分裂。在树构建算法的每次迭代中,选择解释变量和分裂规则的组合,该组合使β分布的对数似然函数最大化,其中参数估计来自当前构建的树的节点。几项模拟研究证明了该方法的特性,并将其性能与经典随机森林方法以及参数回归模型进行了比较。

英文摘要:

Random forests have become an established tool for classification and regression, in particular in high-dimensional settings and in the presence of complex predictor-response relationships. For bounded outcome variables restricted to the unit interval, however, classical random forest approaches may severely suffer as they do not account for the heteroscedasticity in the data. A random forest approach is proposed for relating beta distributed outcomes to explanatory variables. The approach explicitly makes use of the likelihood function of the beta distribution for the selection of splits during the tree-building procedure. In each iteration of the tree-building algorithm one chooses the combination of explanatory variable and splitting rule that maximizes the log-likelihood function of the beta distribution with the parameter estimates derived from the nodes of the currently built tree. Several simulation studies demonstrate the properties of the method and compare its performance to classical random forest approaches as well as to parametric regression models.

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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