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arXiv 1709.02069math.STstat.COstat.MEstat.TH
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函数线性部分分位数回归的一种替代方法

An Alternative Approach to Functional Linear Partial Quantile Regression

University of Texas at Arlington(阿灵顿得克萨斯大学);University of Alberta(阿尔伯塔大学);Queen’s University(女王大学)

Dengdeng Yu, Matthew Pietrosanu, Ivan Mizera, Bei Jiang, Linglong Kong, Wei Tu

AI总结:

针对函数数据预测的高维挑战及现有部分分位数回归缺乏理论保证的问题,提出带收敛保证的替代型APQR公式,建立渐近性质,基准测试表现更优,可用于ADHD、AD等疾病的医学影像预测。

摘要:

随着现代技术的进步,曲线、曲面等函数数据变得越来越常见。由于函数预测变量固有的无限维特性,其使用仍颇具挑战性。常规做法是将函数数据投影到有限维空间中。流行的偏最小二乘(partial least square, PLS)方法已在函数线性模型中得到了充分研究[1]。作为一种替代方案,当响应变量呈非正态、厚尾分布或受异常值污染时,分位数回归能提供更稳健且更全面的条件分布刻画。尽管部分分位数回归(partial quantile regression, PQR)已在文献[2]中被提出,但由于该算法的迭代特性以及分位数损失函数的非光滑性,目前尚无理论保证。为解决这些问题,我们提出了一种具有收敛性保证的替代型PQR(alternative PQR, APQR)公式。这一新公式催生了新的理论,使我们得以建立其渐近性质。在一个基准数据集上的数值研究证明了我们新方法的优越性。我们还将该新方法应用于功能磁共振成像(functional magnetic resonance imaging, fMRI)数据以预测注意缺陷多动障碍(attention deficit hyperactivity disorder, ADHD),并应用于扩散张量成像(diffusion tensor imaging, DTI)数据集以预测阿尔茨海默病(Alzheimer's disease, AD)。

英文摘要:

Functional data such as curves and surfaces have become more and more common with modern technological advancements. The use of functional predictors remains challenging due to its inherent infinite-dimensionality. The common practice is to project functional data into a finite dimensional space. The popular partial least square (PLS) method has been well studied for the functional linear model [1]. As an alternative, quantile regression provides a robust and more comprehensive picture of the conditional distribution of a response when it is non-normal, heavy-tailed, or contaminated by outliers. While partial quantile regression (PQR) was proposed in [2], no theoretical guarantees were provided due to the iterative nature of the algorithm and the non-smoothness of quantile loss function. To address these issues, we propose an alternative PQR (APQR) formulation with guaranteed convergence. This novel formulation motivates new theories and allows us to establish asymptotic properties. Numerical studies on a benchmark dataset show the superiority of our new approach. We also apply our novel method to a functional magnetic resonance imaging (fMRI) data to predict attention deficit hyperactivity disorder (ADHD) and a diffusion tensor imaging (DTI) dataset to predict Alzheimer's disease (AD).

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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