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分类依据与纠错

AI 根据所提供的论文材料归类:摘要明确研究多个条件分位数的效应与跨分位数系数共性,因此对应分位数与分布效应,空间依赖未明确为网络干扰。

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正在核对关联版本…

代码、数据与补充材料

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关注这篇论文的作者
Ping Dong
Jiawei Hou
Yunquan Song

空间分位数自回归模型中的跨分位数收缩

研究问题
在存在空间依赖和空间滞后内生性时,如何联合估计多个分位数的协变量效应,并识别不同分位数之间的共同系数?
方法与思路
作者引入工具变量处理空间滞后内生性,采用融合自适应 LASSO 与融合自适应上确界范数惩罚构造两阶段估计。
材料陈述的贡献
摘要称,所提方法可同时估计分位数参数与识别跨分位数共性,具有预言机性质,数值研究显示相对传统方法的效率改善。
阅读关注点
应核对空间权重与工具变量条件、跨分位数融合机制,以及预言机性质、惩罚参数选择和效率比较的适用设定。
阅读边界
这是 arXiv 预印本,同行评审及期刊接收均未核实;摘要未说明工具变量有效性条件、惩罚选择细节或效率增益数值。

原文摘要

Spatial dependent data frequently occur in many fields such as spatial econometrics and epidemiology. To deal with the dependence of variables and estimate quantile-specific effects by covariates, spatial quantile autoregressive models (SQAR models) are introduced. Conventional quantile regression only focuses on the fitting models but ignores the examination of multiple conditional quantile functions, which provides a comprehensive view of the relationship between the response and covariates. Thus, it is necessary to study the different regression slopes at different quantiles, especially in situations where the quantile coefficients share some common feature. However, traditional Wald multiple tests not only increase the burden of computation but also bring greater FDR. In this paper, we transform the estimation and examination problem into a penalization problem, which estimates the parameters at different quantiles and identifies the interquantile commonality at the same time. To avoid the endogeneity caused by the spatial lag variables in SQAR models, we also introduce instrumental variables before estimation and propose two-stage estimation methods based on fused adaptive LASSO and fused adaptive sup-norm penalty approaches. The oracle properties of the proposed estimation methods are established. Through numerical investigations, it is demonstrated that the proposed methods lead to higher estimation efficiency than the traditional quantile regression.

笔记与分组