Quality of employment in Latin America: Theory and evidence

Historically, the development literature concerned with Latin American labour markets has focused on job numbers and productivity. But given the persistence of large shares of informal and now otherwise precarious employment, the authors argue that meaningful analysis also requires consideration of the implications of occupational status for the quality of employment. Based on empirical evidence from recent decades, they conclude that most dimensions of this concept – including social protection – depend on the conclusion of a written contract of employment. This finding leads them to outline policy options for stabilizing formal employment and securing adequate funding for social protection.     

20世纪50年代以来中国近代民族史研究述要

本文从中国近代史学对民族史的研究、中国民族史学对近代史的研究两方面总结了20世纪50年代以来中国近代民族史研究的成绩与不足,认为近代史和民族史学科界线分明,较少交叉与对话,同时影响了两个学科的全面发展,从而提出"中国近代史研究的民族史视角"观点,主张从我国多民族史的角度重新审视中国近代史上的诸多问题。     

Estimators for the Horvitz-Thompson Statistic Based on Some Posterior Distributions

The knowledge of first-order inclusion probabilities characterizing a sampling scheme is essential in design-based estimation of finite population totals. Sometimes the scheme is so complex that these probabilities cannot be computed exactly. Instead, both inclusion probabilities and corresponding sampling weights are simulated. One empirical Horvitz-Thompson estimator for a population total using simulation-based range-preserving estimates of sampling weights is obtained by applying the restricted maximum likelihood principle directly to each inclusion probability. The assumption of a prior distribution and the assessment of resulting posterior for a weight lead to two other estimators. One of them is the posterior mean estimator of the Horvitz-Thompson statistic. In a simulation involving Polish agricultural census data and a sequential fixed-cost sampling scheme, this estimator has attractive properties also from a frequentist point of view.     

A Comparison of Mental Health,Substance Use,and Sexual Risk Behaviors Between Rural and Non-Rural Transgender Persons

The aim of this study was to compare the mental health, substance use, and sexual risk behaviors of rural and non-rural transgender persons. Online banner advertisements were used to recruit 1,229 self-identified rural and non-rural transgender adults (18+ years) residing in the United States. Primary findings include significant differences in mental health between rural and non-rural transmen; relatively low levels of binge drinking across groups, although high levels of marijuana use; and high levels of unprotected sex among transwomen. The results confirm that mental and physical health services for transgender persons residing in rural areas are urgently needed.     

家族企业代际传承人培养问题研究——基于顺德民营家族企业的调查

长期以来,代际传承问题一直是世界家族企业研究领域的首要问题。而随着开创了经济奇迹的第一代创业者逐渐老去,中国家族企业也即将迎来以代际传承为主的传承浪潮。在此背景下,文章以佛山市顺德区200家民营家族企业为研究对象,从顺德民营家族企业传承的现状、代际传承人的拟定和培养等方面进行实证研究,探讨家族代际传承人的培养问题,从代际传承人的学校教育、能力培养、后续教育及圈子建立等方面提出具有实际操作意义的建议。     

教育扩展与大学生就业率的变化

典型调查表明,就业率在教育扩展中呈现下降趋势,近二年研究生处于短缺或基本平衡状态,本科生处于就业困难状态,专科生处于就业危机状态,不同专业毕业生的就业率存在一定差异。这是我国人力资本投资的风险增大和信号性功能减弱的体现。应根据我国经济发展需要做好高等教育的合理规划,调整高等教育的扩招速度、层次结构和专业结构,规范就业率统计体系,以促进大学生就业。     

测量演练室-理论与实践教学结合的空间

工程测量是一门理论与实践紧密结合的课程,且仪器的实践操作是教学效果的关键,演练室教学达到理论和实践教学的双重功能,提高了教学质量,加快了教学进度。     

受访者推动抽样：研究隐藏人口的方法与实践

“隐藏人口”的特点是规模较小且成员一般不愿暴露身份，因此很难使用常规抽样方法对其进行研究。近年来出现了一种新的研究隐藏人口的方法——受访者推动抽样（RDS)方法，该方法在传统“雪球抽样”方法的基础上，结合社会网络分析的理论和方法，使研究者有可能根据样本对总体特征做出合理的推论。本文对RDS方法的理论渊源、基本思路、主要操作步骤和原理进行了简要介绍，并探讨了在实际操作过程中应注意的问题。     

Distance sampling methodology

We consider the method of distance sampling described by Buckland, Anderson, Burnham and Laake in 1993. We explore the properties of the methodology in simple cases chosen to allow direct and accessible comparisons of distance sampling in the design- and model-based frameworks. In particular, we obtain expressions for the bias and variance of the distance sampling estimator of object density and for the expected value of the recommended analytic variance estimator within each framework. These results enable us to clarify aspects of the performance of the methodology which may be of interest to users and potential users of distance sampling.     

Estimating the Size of a Subdomain: An Application in Auditing

This article suggests an alternative to the ratio estimator for estimating the total size of a subdomain of a population. The application that served as the genesis for this work is from auditing. The problem is to estimate the total of sales transactions that are not tax exempt from an audit sample of the population of nontaxed sales transactions. A superpopulation approach, which models the unit's probability of belonging to the subdomain as a function of its size, leads to a family of estimators. The simplest member of this famiiy is one in which that function is specified to be a constant. The optimal estimator for this model performs markedly better than the ratio estimator when the assumption is true and often performs better when it is not, though in that case it is biased. Stratification is shown to reduce this bias and at the same time make the ratio estimator more similar to the optimal estimator. A simulation experiment shows that the theoretical advantages hold in a real audit population.