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arXiv 0911.3501math.STstat.TH
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部分线性变系数模型中的分位数回归

Quantile regression in partially linear varying coefficient models

Huixia Judy Wang, Zhongyi Zhu, Jianhui Zhou

摘要:

半参数模型通常被认为是分析纵向数据的灵活性和简约性之间的良好平衡。本文研究了一类可能变系数的边际部分线性分位数模型。函数系数由基函数近似估计。估计过程易于实现,并且不需要指定误差分布。所提出的估计的渐近性质,以及为常系数的变系数建立。我们开发秩分数检验的假设的系数,包括假设的一个子集的恒定性的变化系数。这种类型的假设检验在理论上具有挑战性,因为在零假设和备择假设下的参数空间的维数随着样本量的增加而增加。我们评估有限样本性能的Monte Carlo模拟研究所提出的方法,并证明其价值的艾滋病数据集的分析,分位数的建模提供了更全面的信息比通常的最小二乘法。

英文摘要:

Semiparametric models are often considered for analyzing longitudinal data for a good balance between flexibility and parsimony. In this paper, we study a class of marginal partially linear quantile models with possibly varying coefficients. The functional coefficients are estimated by basis function approximations. The estimation procedure is easy to implement, and it requires no specification of the error distributions. The asymptotic properties of the proposed estimators are established for the varying coefficients as well as for the constant coefficients. We develop rank score tests for hypotheses on the coefficients, including the hypotheses on the constancy of a subset of the varying coefficients. Hypothesis testing of this type is theoretically challenging, as the dimensions of the parameter spaces under both the null and the alternative hypotheses are growing with the sample size. We assess the finite sample performance of the proposed method by Monte Carlo simulation studies, and demonstrate its value by the analysis of an AIDS data set, where the modeling of quantiles provides more comprehensive information than the usual least squares approach.

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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