Geographically Weighted Cox Regression for Prostate Cancer Survival Data in Louisiana

The Cox proportional hazard model is one of the most popular tools in analyzing time-to-event data in public health studies. When outcomes observed in clinical data from different regions yield a varying pattern correlated with location, it is often of great interest to investigate spatially varying effects of covariates. In this paper, we propose a geographically weighted Cox regression model for sparse spatial survival data. In addition, a stochastic neighborhood weighting scheme is introduced at the county level. Theoretical properties of the proposed geographically weighted estimators are examined in detail. A model selection scheme based on the Takeuchi’s model robust information criteria is discussed. Extensive simulation studies are carried out to examine the empirical performance of the proposed methods. We further apply the proposed methodology to analyze real data on prostate cancer from the Surveillance, Epidemiology, and End Results cancer registry for the state of Louisiana.     

珍稀的清宫紫檀雕龙纹宝座

这座宝座是由台湾收藏家陈先生从美国重金购得，今秋由中贸圣佳拍卖公司自台湾征集而来，是名副其实的海外回流的宫廷文物。     

明代“朝班”考述

朝班是朝会的基础,也是官员品秩及尊卑等差的直接体现。明初,朝班专准品级,其后兼隆侍从,又移于权势,改于因循,出现了次序参错,班行混淆的现象。班序的紊乱,直观地反映了政治情势的变迁。本文对明代朝班做了框架式的描述,并且分析了朝班变化的特点以及造成其变化的原因。     

高铁沿线旅游流网络结构及其互动关系研究——以合福高铁沿线地区为例

利用复杂网络分析方法，对合福高铁沿线城市和景区两个尺度上的旅游流网络结构和互动关系进行研究。结果表明：①合福高铁沿线旅游流网络规模大，覆盖面积广，但网络密度极低，具有显著的"中心-外围"结构；②合福高铁沿线核心旅游城市和重点旅游景区在网络中的功能突出、角色重要，其中高能级景区表现出较强的辐射效应，对周边节点具有较强的带动作用；③合福高铁沿线旅游景区之间已经形成了"一超多强"、"双核互动"和"单节点"三种合作关系，但网络中的合作关系受行政边界的屏蔽仍十分明显。