Semiparametric inference for a two-stage outcome-dependent sampling design with interval-censored failure time data

Lifetime Data Analysis - We propose a two-stage outcome-dependent sampling design and inference procedure for studies that concern interval-censored failure time outcomes. This design enhances the...     

Opportunities for woman-initiated HIV prevention methods among female sex workers in southern China

Rapid changes in China over the past two decades have led to significant problems associated with population migration and changing social attitudes, including a growing sex industry and concurrent increases in STIs and HIV. This article reports results of an exploratory study of microbicide acceptability and readiness and current HIV prevention efforts among female sex workers in two rural and one urban town in Hainan and Guangxi Provinces in southern China. The study focused on these women's knowledge and cultural understandings of options for protecting themselves from exposure to STIs and HIV, and the potential viability and acceptability of woman-initiated prevention methods. We report on ethnographic elicitation interviews conducted with women working within informal sex-work establishments (hotels, massage and beauty parlors, roadside restaurants, boarding houses). We discuss implications of these findings for further promotion of woman-initiated prevention methods such as microbicides and female condoms among female sex workers in China.     

西部城市公用事业运营模式改革的路径选择——以西部三省(陕西、甘肃、四川)为例

一、引言 城市公用事业是城市为市民提供基础设施和公共服务的重要内容,包括城市供水、供电、供热、供气、公共交通、排水、污水处理、道路桥梁、市政设施、市容卫生、垃圾处理和城市绿化等方面.城市公用事业是城市经济社会发展的载体,直接关系到社会的公共利益和可持续发展.     

Economic Inequality is Associated with Lower Internet Use: A Nationally Representative Study

Social Indicators Research - Previous studies have documented the associations of objective class with either social capital or subjective social status, yet little attention has been paid to the...     

Outlier detection and robust variable selection via the penalized weighted LAD-LASSO method

This paper studies the outlier detection and robust variable selection problem in the linear regression model. The penalized weighted least absolute deviation (PWLAD) regression estimation method and the adaptive least absolute shrinkage and selection operator (LASSO) are combined to simultaneously achieve outlier detection, and robust variable selection. An iterative algorithm is proposed to solve the proposed optimization problem. Monte Carlo studies are evaluated the finite-sample performance of the proposed methods. The results indicate that the finite sample performance of the proposed methods performs better than that of the existing methods when there are leverage points or outliers in the response variable or explanatory variables. Finally, we apply the proposed methodology to analyze two real datasets.     

桂南"跳岭头"与"跳大排"初探

桂南“跳岭头”与“跳大排”在本质上都是一种驱逐鬼疫的巫术,在其历史延续过程中不断杂糅了当地民俗与道教等因素,与民间节庆融为一体,成为上古驱傩活动的变异形态,既娱神又娱人。二者都在农历八、九月间举行,流行地域毗邻,可相互观照进行对比研究。     

The nested joint clustering via Dirichlet process mixture model

This article focuses on the clustering problem based on Dirichlet process (DP) mixtures. To model both time invariant and temporal patterns, different from other existing clustering methods, the proposed semi-parametric model is flexible in that both the common and unique patterns are taken into account simultaneously. Furthermore, by jointly clustering subjects and the associated variables, the intrinsic complex shared patterns among subjects and among variables are expected to be captured. The number of clusters and cluster assignments are directly inferred with the use of DP. Simulation studies illustrate the effectiveness of the proposed method. An application to wheal size data is discussed with an aim of identifying novel temporal patterns among allergens within subject clusters.     

A primal dual active set with continuation algorithm for high-dimensional nonconvex SICA-penalized regression

The smooth integration of counting and absolute deviation (SICA) penalty has been demonstrated theoretically and practically to be effective in nonconvex penalization for variable selection and parameter estimation. However, solving the nonconvex optimization problem associated with SICA penalty in high-dimensional setting remains to be enriched, mainly due to the singularity at the origin and the nonconvexity of the SICA penalty function. In this paper, we develop a fast primal dual active set (PDAS) with continuation algorithm for solving the nonconvex SICA-penalized least squares in high dimensions. Upon introducing the dual variable, the PDAS algorithm iteratively identify and update the active set in the optimization using both the primal and dual information, and then solve a low-dimensional least square problem on the active set. When combined with a continuation strategy and a high-dimensional Bayesian information criterion (BIC) selector on the tuning parameters, the proposed algorithm is very efficient and accurate. Extensive simulation studies and analysis of a high-dimensional microarray gene expression data are presented to illustrate the performance of the proposed method.     

完善公司治理结构中经理人约束与激励机制

建立经理人的市场约束机制,完善独立董事制度,充分发挥监事会的监督作用,是完善我国公司治理结构中经理人约束机制的重要措施。制订一套有效的经理人员报酬设计方案,使隐形的在职消费公开化、制度化,是完善我国公司治理结构中经理人员激励机制的重要途径。     

回顾与前瞻:中国的成人教育与人力资源开发

教育是人力资源开发的基本手段,成人教育则是人力资源开发的关键所在。通过成人教育进行人力资本投资,提高了劳动者素质;优化人力资源配置,促进城镇失业和农村剩余劳动力转移问题的解决;并对产业进步、企业发展及完善劳动力市场发挥积极作用。成人教育未来走向是贯彻终身教育理念,注重人的全面发展,关注老年教育。