Multigenerational punishments on the children of Salvadoran immigrant and deported fathers

Drawing on qualitative research conducted in the United States and in El Salvador, the author examines the experiences of the children of 40 immigrant men and 40 deported men. This study reveals the harmful effects of U.S. immigration policies and enforcement practices on the children of Salvadoran immigrant and deported fathers. Their children were found to have experienced the unintended consequences of U.S. immigration laws and enforcement practices in their own lives and relationships. These findings support Enriquez's (2015) concept of “multigenerational punishments” where children of immigrant parents share the risks and limitations associated with their parent's immigration status. They also experience the negative spill-over effects of immigration policies and enforcement practices even though they were not directly targeted by these laws. This study reveals multigenerational punishments manifested in the form of social, economic, emotional, and physical inequalities which negatively affected the children of Salvadoran immigrant and deported fathers. As a result, many of their children experienced harmful changes in their lives and relationships under the U.S. immigration enforcement regime. This study is significant in that it provides insight into the issues that immigrant families face and the need for policy interventions for immigrant and deported parents and their children.     

ESTIMATION OF MULTIVARIATE SHANNON ENTROPY USING MOMENTS

Three new entropy estimators of multivariate distributions are introduced. The two cases considered here concern when the distribution is supported by a unit sphere and by a unit cube. In the former case, the consistency and the upper bound of the absolute error for the proposed entropy estimator are established. In the latter one, under the assumption that only the moments of the underlying distribution are available, a non‐traditional estimator of the entropy is suggested. We also study the practical performances of the constructed estimators through simulation studies and compare the estimators based on the moment‐recovered approaches with their counterparts derived by using the histogram and k th nearest neighbour constructions. In addition, one worked example is briefly discussed.     

Generalized discrete discrepancy and its applications in experimental designs

In recent years, there has been increasing interest in the study of discrete discrepancy. In this paper, the popular discrete discrepancy is extended to the so-called generalized discrete discrepancy. Connections among generalized discrete discrepancy and other optimality criteria, such as orthogonality, generalized minimum aberration and minimum moment aberration, are investigated. These connections provide strong statistical justification of generalized discrete discrepancy. A lower bound of generalized discrete discrepancy is also obtained, which serves as an important benchmark of design uniformity.     

矩约束模型的最优矩条件选取方法

大量经济、金融以及企业管理等领域研究对象的行为特征可以通过矩约束模型来刻画。然而,该模型中参数的估计对矩条件的选取非常敏感。如何选取最优的矩条件,进而得到更准确的参数估计和更精确的统计推断,是实证研究面临的重要问题。本文从估计量均方误差（MSE）最小的角度,研究了一般矩约束模型两步有效广义矩（GMM）估计的最优矩条件选取方法。首先,利用迭代的方法,推导出两步有效GMM估计的高阶MSE,然后通过Nagar分解,求出了两步有效GMM估计量的近似MSE。接着,基于近似MSE表达式,给出了两步有效GMM估计矩条件选取准则的一般理论,即定义了最优的矩条件,提出了两步有效GMM估计的最优矩条件选取准则,并证明了选取准则的渐近有效性。模拟结果表明,本文提出的矩条件选取方法能够很好地改善两步有效GMM估计量的有限样本表现,降低估计量的有效样本偏差。本研究为实证研究中面临的矩条件选择问题提供了理论依据。     

Computing and approximating multivariate chi-square probabilities

We consider computational methods for evaluating and approximating multivariate chi-square probabilities in cases where the pertaining correlation matrix or blocks thereof have a low factorial representation. To this end, techniques from matrix factorization and probability theory are applied. We outline a variety of statistical applications of multivariate chi-square distributions and provide a system of MATLAB programs implementing the proposed algorithms. Computer simulations demonstrate the accuracy and the computational efficiency of our methods in comparison with Monte Carlo approximations, and a real data example from statistical genetics illustrates their usage in practice.     

Estimating the probability of obtaining nonfeasible parameter estimates of the generalized pareto distribution

In this paper we consider the problem of estimating the parameters of the generalized Pareto distribution. Both the method of moments and probability-weighted moments do not guarantee that their respective estimates will be consistent with the observed data. We present simple programs to predict the probability of obtaining such nonfeasible estimates. Our estimation techniques are based on results from intensive simulations and the successful modelling of the lower tail of the distribution of the upper bound of the support. More simulations are performed to validate the new procedure.     

数学教育评价的马尔科夫链模型应用

通过分析学生两次高等代数的测试成绩,应用马尔可夫链分析法考虑学生的原始状态,并在同一标准下把学生的原始成绩分成相同的等级,确定出状态空间,然后得出转移概率和转移矩阵,根据马尔可夫链模型的平稳性及遍历性求出极限向量,并进行比较判断结果表明,学生学习状态的转移概率仅与教学质量和教学条件有关,而与学生的基础无关。运用该方法对教学质量的评价说明,学生的进步情况比学生成绩本身更重要,客观地看出教师在教学方法上的优势和劣势,并使教师获取教学的反馈信息,以对自己的教学行为进行反思和调整,促进教师教学水平的提高。     

Beyond Rhetorical Differences: A Cohesive Account of Post‐devolution Developments in UK Health Policy

Health is perhaps the most significant policy area to be devolved to decision‐makers in Northern Ireland, Scotland and Wales. Consequently, there has been a great deal of interest in assessing the extent to which health policies (which already differed somewhat prior to devolution) have diverged since 1999. To date, analyses have tended to focus either on health care policies or on specific public health issues (e.g. health inequalities or tobacco control). The story that emerges from this body of work suggests health care policies have diverged significantly, whilst public health policies have remained remarkably similar. This article is one of the first to consider health care and public health policy alongside each other. It reassesses and updates previous analyses, incorporating developments relating to the 2010 general election and the 2007 and 2011 devolved administration elections. Drawing on a variety of textual sources (policy documents, research evidence and corporate literature), our findings differ from existing analyses in suggesting that, despite some noticeable differences in policy rhetoric, approaches to both health care provision and tackling public health problems remain similar. Looking to the future, the article concludes that the common economic challenges, combined with a tight fiscal policy (that remains excepted from devolution), means the similarities in health care provision across the UK are likely to remain more pronounced than the differences. However, current debate about the constitutional settlement, and in particular the prospect of greater fiscal freedoms for the devolved administrations, may provide opportunities for more meaningful divergence in health policy than has been possible hitherto.