Proportional Odds Models with High‐Dimensional Data Structure

The proportional odds model is the most widely used model when the response has ordered categories. In the case of high‐dimensional predictor structure, the common maximum likelihood approach typically fails when all predictors are included. A boosting technique pomBoost is proposed to fit the model by implicitly selecting the influential predictors. The approach distinguishes between metric and categorical predictors. In the case of categorical predictors, where each predictor relates to a set of parameters, the objective is to select simultaneously all the associated parameters. In addition, the approach distinguishes between nominal and ordinal predictors. In the case of ordinal predictors, the proposed technique uses the ordering of the ordinal predictors by penalizing the difference between the parameters of adjacent categories. The technique has also a provision to consider some mandatory predictors (if any) that must be part of the final sparse model. The performance of the proposed boosting algorithm is evaluated in a simulation study and applications with respect to mean squared error and prediction error. Hit rates and false alarm rates are used to judge the performance of pomBoost for selection of the relevant predictors.     

Some Properties of Past Entropy and their Applications

In the context of information theory, measure of uncertainty in past lifetime distribution has been proposed by Di Crescenzo and Longobardi (J Appl Probab 39:434–440, 2002). In this paper, we study some ordering and aging properties in terms of past entropy (based on past lifetime) and develop some characterization results. Some discrete distribution results are also addressed here.     

WHAT IS THE EFFECT OF HOUSEWORK ON THE MARKET WAGE,AND CAN IT EXPLAIN THE GENDER WAGE GAP?

Abstract Does housework reduce the market wage, and if so, does it have a similar impact for males and females? In this paper, we survey and evaluate the recent and growing empirical literature on the linkages between housework and the wage rate. The review is motivated by unexplained gender wage gaps across studies, which consider personal and market‐related factors. We focus on this less‐studied aspect of wage determination. We consider the required modelling framework, and provide standardized estimated effects of housework on the hourly wage across studies. We evaluate how this literature has addressed potential estimation problems, in particular, the endogeneity of housework, concavity of the housework–wage function, threshold effects and work effort effects. We conclude that the evidence across ordinary least squares, instrumental variable, fixed effects and two‐stage least squares results casts serious doubt on the idea that the negative female housework–wage relationship is only driven by endogeneity bias or individual‐specific characteristics. Yet, much more needs to be done to address modelling and data requirements, and we point out likely and promising future research directions.     

Memoryless Reigns of the “Sons of Heaven”

Human lifetimes have increasing failure rates; as people age (beyond early childhood) they are more likely to die. Viewing the succession of Chinese Emperors as a statistical ensemble we show that, unlike lifetimes, their reigns ceased at a constant rate for over two millennia, unaffected by elapsed time. In fact reign lengths of the “Sons of Heaven”, as the Chinese Emperors were known, followed a memoryless exponential distribution with a 10-year half-life. Becoming emperor not only influenced the duration of remaining life, but length of rule was independent of age at ascent. We propose an explanation for the observed exponentiality using asymptotic results from the theory of stationary stochastic processes.     

探究高职生心理调动其学习兴趣

本文通过对高职生学习心理的探索、学习障碍的原因分析,指出在教学中帮助他们增强学习的信心、培养他们的学习兴趣、更新评价理念和进行成功教育是实现转化的有效途径。     

山区城市打造区域职业教育中心的分析及建议

本文在分析永安市开展职业教育工作优势和劣势的基础上,就山区城市如何打造区域职业教育中心提出了合理化建议。     

猎头顾问提高人选推荐成功率的路径与技法

近年来,猎头行业在中国本土迅速发展,猎头顾问作为猎头公司的核心资源,在根本意义上决定了猎头公司的可持续发展。本文将围绕猎头顾问如何提高人选推荐成功率的一些路径与方法展开。     

从国际经验看利率市场化对我国金融运行的影响

在十二五时期,我国的利率市场化进程将不断加快,而在这个阶段中,放开存贷款利率已经成为了我国开展市场化改革的一项重要任务。在本文中,将从国际经验的角度对利率市场化对我国金融运行的影响进行一定的研究与分析。     

RMS5000产品可靠性信息管理系统设计

RMS5000产品可靠性信息管理系统是一套基于产品可靠性设计理念的信息管理系统,该系统从可靠性设计流程标准化、潜在缺陷分析、可靠性应力分析、可靠性测试流程标准化、设计评审审核、经验数据累计等几方面为用户提供了一整套技术有效、管理科学的可靠性技术体系。该系统旨在规范可靠性设计和测试流程、提高可靠性设计效率和产品质量。本文通过图文相结合的方式向用户全面阐述了该系统的设计理念、设计架构、产品开组成以及技术特点。希望能通过本文的介绍,向大家展示一个基于可靠性的产品开发体系模型,给设计人员在产品可靠性设计方面提供更多的帮助。     

人民币升值对我国进出口企业的影响分析

汇率改革两年多来,我国人民币一直处于升值通道中,人民币升值对我国经济的各个方面带来了不同的影响,对于以国际业务为主的进出口企业更是影响深刻。文章在总结汇率改革历程的基础上,分析了人民币升值对我国进出口企业的影响。