arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1906.03151stat.ME
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多元条件转换模型

Multivariate Conditional Transformation Models

Nadja Klein, Torsten Hothorn, Luisa Barbanti, Thomas Kneib

AI总结:

针对现有多元回归模型依赖结构简化假设的局限,提出多元条件转换模型通用框架,支持协变量非线性效应和可变依赖结构,可扩展至二元以上响应,并在儿童营养不良分析中验证其推断复杂多元数据过程的优越性。

摘要:

描述在协变量信息条件下多元响应变量联合分布的回归模型,已成为当代回归分析的重要方面。然而,此类模型的一个局限在于它们往往依赖过于简化的假设,例如不随协变量变化的恒定依赖结构,或仅限于响应变量之间的线性依赖关系。我们提出了一个多元条件转换模型的通用框架,克服了这些局限,并在协变量非线性效应的条件下,以易于处理、可解释且灵活的方式描述整个分布。该框架可嵌入基于似然的推断中,包括渐近正态性的结果,并允许依赖结构随协变量变化。此外,该框架能很好地扩展到二元响应情形之外,而二元响应是早期大多数研究的主要焦点。我们在儿童营养不良的三元分析中展示了多元条件转换模型的应用,并实证表明,与现有基准相比,我们的方法具有优势,能够从观测中推断出真正复杂的多元数据生成过程。

英文摘要:

Regression models describing the joint distribution of multivariate response variables conditional on covariate information have become an important aspect of contemporary regression analysis. However, a limitation of such models is that they often rely on rather simplistic assumptions, e.g. a constant dependency structure that is not allowed to vary with the covariates or the restriction to linear dependence between the responses only. We propose a general framework for multivariate conditional transformation models that overcomes these limitations and describes the entire distribution in a tractable and interpretable yet flexible way conditional on nonlinear effects of covariates. The framework can be embedded into likelihood-based inference, including results on asymptotic normality, and allows the dependence structure to vary with covariates. In addition, the framework scales well beyond bivariate response situations, which were the main focus of most earlier investigations. We illustrate the application of multivariate conditional transformation models in a trivariate analysis of childhood undernutrition and demonstrate empirically that our approach can be beneficial compared to existing benchmarks such that complex truly multivariate data-generating processes can be inferred from observations.

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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