On a superiority problem in misspecified restricted linear models

Razzaghi (1987) conjectures that a wrong choice of covariance matrix in a restricted linear model results in loss of efficiency, This conjecture is proved to be correct.     

明清之际西洋绘画在中国衰退的缘由

明清之际，随着西方文明的传入，形成了一个独特的画种，即以中国的工具和材料表现西洋的绘画方式。这一任务是由部分传教士完成的，它是中西文化相交融的产物。但由于中国长期间关，固守传统文化，加上中西文化数千年的差异，因此导致这一画种很快衰退。     

非政府间国际组织的国际法律人格限制性评析

随着国际关系的发展,非政府间国际组织参与国际活动越来越频繁,作用越来越大,但是它们至今仍不具有国际法主体资格,不能直接承受国际法上的权利义务,这必然会影响和限制其作用的发挥。本文旨在通过分析和评价国际非政府组织的法律人格的受局限性,得出尽快赋予其国际法主体资格的紧迫性和必要性,以充分发挥非政府间国际组织对国际关系和国际法的影响和作用,只有这样,才能更好地适应国际社会发展的现实需要。     

The Perceived Health Risks of Indoor Radon Gas and Overhead Powerlines: A Comparative Multilevel Approach

Radon and overhead powerlines are two radiation risk cases that have raised varying levels of concern among the general public and experts. Despite both involving radiation—a typically feared and unseen health hazard—individuals' perceptions of the two risk cases may invoke rather different factors. We examined individual and geographic-contextual factors influencing public perceptions of the health risks of indoor radon gas and overhead powerlines in a comparative research design, utilizing a postal questionnaire with 1,528 members of the general public (response rate 28%) and multilevel modeling techniques. This study found that beliefs about the two risk cases mainly differed according to the level of "exposure"—defined here in terms of spatial proximity. We argue that there are two alternative explanations for this pattern of findings: that risk perception itself varies directly with proximity, or that risk is more salient to concerned people in the exposed areas. We also found that while people living in high radon areas are more concerned about the risks of indoor radon gas, they find these risks more acceptable and have more trust in authorities. These results might reflect the positive effects of successive radon campaigns in high radon areas, which may have raised awareness and concern, and at the same time may have helped to increase trust by showing that the government takes the health risks of indoor radon gas seriously, suggesting that genuine risk communication initiatives may have positive impacts on trust in risk management institutions.     

Family Structure and Child Mortality in Sub‐Saharan Africa: Cross‐National Effects of Polygyny

This study applies multilevel logistic regression to Demographic and Health Survey data from 22 sub‐Saharan African countries to examine whether the relationship between child mortality and family structure, with a specific emphasis on polygyny, varies cross‐nationally and over time. Hypotheses were developed on the basis of competing theories on the relationship between child health and family structure. Although children of mothers in polygynous marriages are more likely to die than those of mothers in monogamous unions, the relationship is constant across time. Familial factors including education, socioeconomic status (SES), and urban residence accounted for most of the observed cross‐national variation associated with polygyny. Consequently, improving maternal education and household SES would greatly benefit child health in sub‐Saharan Africa.     

中国房地产限售政策对房价的影响研究——兼论限售和限购的政策组合效应

自2017年3月以来，中国多个城市相继出台了房地产限售政策。本文基于2017年1月至2018年5月的全国城市月度数据，针对限售政策分期出台的实际情况，构建更具适用性的多期双重差分模型（Multi-Stage Difference-in-Difference），分别从国家和城市层面实证分析了限售政策平抑房价的效果及其异质性。在此基础上，又对限售政策和限购政策的联合效应进行研究。研究结果表明：房地产限售政策能显著平抑房价且效果具有异质性。具体而言，在国家层面，限售政策对房价的平抑效果二手房强于新房、小户型强于中大户型；在城市层面，其平抑房价的效果一线城市强于二三线城市、中西部城市强于东部城市。此外，双限政策的联合效果优于单一限售政策。以上研究对进一步发掘限售政策的独特价值具有现实意义。     

Modeling Repeatable Events Using Discrete‐Time Data: Predicting Marital Dissolution

I join two methodologies by illustrating the application of multilevel modeling principles to hazard‐rate models with an emphasis on procedures for discrete‐time data that contain repeatable events. I demonstrate this application using data taken from the 1995 National Survey of Family Growth (NSFG) to ascertain the relationship between multiple covariates and risk of subsequent marital dissolution. I consider both fixed‐ and random‐effects versions of the multilevel model, as well as a Generalized Estimating Equation alternative to estimating random effects. I compare results obtained from the various estimators, noting why differences occur, and recommend when to choose the various alternatives. I also provide a set of SAS and STATA programs that can be used to analyze the NSFG data.     

多水平面板数据模型的估计理论及模拟研究

将面板数据模型和多水平模型结合起来,提出了多水平面板数据模型。通过分析该模型的方差协方差结构,采用迭代广义最小二乘法和限制迭代广义最小二乘法,导出模型的参数估计,并通过模拟数据进行了比较分析。结果认为：与多水平模型和面板数据模型相比,该模型能更好地拟合具有层次结构的面板数据。     

Political trust,young people and institutions in Europe. A multilevel analysis

The constant decline of political trust has been shown in political sociology. Young people in particular seem to display lower levels of political trust, which is a challenge for the sustainability of democracy. Still, these levels of political trust among youth differ greatly from one country to another. This article therefore seeks to answer the following question: How can we account for cross‐national diversity with regard to young people’s political trust? To answer this question, I performed multilevel analyses based on data from the European Social Survey. I show in the article that cross‐national diversity stems from the institutional arrangements that structure entry into adulthood, i.e., what I call ‘youth welfare citizenship regimes’: The more inclusive is the youth economic citizenship and the more individualised is their social citizenship, the higher is young people’s political trust – which could buffer the decline in political trust.     

Ridge estimator with correlated errors and two-stage ridge estimator under inequality restrictions

Liew (1976a Liew, C.K. (1976a). A two-stage least-squares estimation with inequality restrictions on parameters. Rev. Econ. Stat. LVIII(2):234–238.[Crossref], [Web of Science ®] , [Google Scholar]) introduced generalized inequality constrained least squares (GICLS) estimator and inequality constrained two-stage and three-stage least squares estimators by reducing primal–dual relation to problem of Dantzig and Cottle (1967 Dantzig, G.B., Cottle, R.W. (1967). Positive (semi-) definite matrices and mathematical programming. In: Abadie, J., ed. Nonlinear Programming (pp. 55–73). Amsterdam: North Holland Publishing Co. [Google Scholar]), Cottle and Dantzig (1974 Cottle, R.W., Dantzig, G.B. (1974). Complementary pivot of mathematical programming. In: Dantzig, G.B., Eaves, B.C., eds. Studies in OptimizationVol. 10. Washington: Mathematical Association of America. [Google Scholar]) and solving with Lemke (1962 Lemke, C.E. (1962). A method of solution for quadratic programs. Manage. Sci. 8(4):442–453.[Crossref], [Web of Science ®] , [Google Scholar]) algorithm. The purpose of this article is to present inequality constrained ridge regression (ICRR) estimator with correlated errors and inequality constrained two-stage and three-stage ridge regression estimators in the presence of multicollinearity. Untruncated variance–covariance matrix and mean square error are derived for the ICRR estimator with correlated errors, and its superiority over the GICLS estimator is examined via Monte Carlo simulation.