Non‐parametric Copula Estimation Under Bivariate Censoring

In this paper, we consider non‐parametric copula inference under bivariate censoring. Based on an estimator of the joint cumulative distribution function, we define a discrete and two smooth estimators of the copula. The construction that we propose is valid for a large range of estimators of the distribution function and therefore for a large range of bivariate censoring frameworks. Under some conditions on the tails of the distributions, the weak convergence of the corresponding copula processes is obtained in l^∞([0,1]²). We derive the uniform convergence rates of the copula density estimators deduced from our smooth copula estimators. Investigation of the practical behaviour of these estimators is performed through a simulation study and two real data applications, corresponding to different censoring settings. We use our non‐parametric estimators to define a goodness‐of‐fit procedure for parametric copula models. A new bootstrap scheme is proposed to compute the critical values.     

Street children in Moscow: using and creating social capital

The paper analyses the strategies of homeless street children in Moscow connected with the accumulation of social capital. Based on recent empirical research, it looks at the involvement of children in non‐criminal and criminal subcultures as a way to get access to important networks and resources, and shows how young people use their social skills and appropriate subcultural norms and values in order to build alternative careers. It demonstrates that children's social background plays an important role in their trajectories in the urban informal economy and society, and that they should not be viewed, as it is usually suggested in the social exclusion paradigm, as a single dispossessed mass which has fallen through support networks in various risk scenarios. Research data is reviewed to provide evidence that Moscow's homeless children are resourceful and deeply social agents who fmd surrogate families and ad hoc social memberships.     

Assessment of Teen Pregnancy Prevention Interventions Among Middle School Youth

The purpose of this study was to examine outcomes for students enrolled in two teen pregnancy prevention programs: the Youth Asset Development Program (YADP); and the Postponing Sexual Involvement Program (PSIP) and identify possible areas for program refinement. The study design consisted of two sets of comparisons: (a) sixth-grade students who completed the PSIP versus the control school; and (b) the YMCA Success Centers where the YADP was introduced versus the control school. Two hundred thirty-seven students were selected to participate in the study. Students who participated in the prevention programs had significantly (p < .05) higher academic achievement, participation in school related activities, and enjoyed school much more than students from the control school. However, no statistically significant differences were found between program participants and the control group when they were compared on personal orientation and judgments about teenage parenthood. Implications for program modification and program effectiveness are discussed.     

Describing the context and nature of emotional maltreatment reports in children

The circumstances leading to reports of emotional maltreatment are potentially unique from those of other abuse types. This study utilized data from the National Child Abuse and Neglect Data System (NCANDS), which is a federally sponsored effort requiring the submission of case-level data on all children who were subject to maltreatment investigations by state child welfare agencies. The central aims of this study were to examine case-level characteristics of sole occurrences of emotional maltreatment Child Protective Service (CPS) reports in an effort to address how caregiver and child risk correlates affect the substantiation of these allegations. A cluster analysis was performed to explore how the risk assessment factors grouped together; secondarily, the cluster groupings were examined in a logistic regression model to measure factors associated with substantiation of these abuse reports. Four unique clusters emerged, with one cluster absent any risk assessment factors entirely and another cluster solely composed of domestic violence. Caregiver risk factors with the highest odds of predicting report substantiation included caregiver substance abuse, domestic violence, and caregiver learning disabilities.     

Relationship between childbirth and access to postsecondary education among young women ageing out of foster care

Early childbirth is common among young women ageing out of foster care and may impede their educational progress. However, few studies have explored access to postsecondary education among young mothers who have been in foster care. The present study used data from a large, national sample of young people in foster care (National Youth in Transition Database, NYTD) to examine the link between early childbirth and young women's access to postsecondary education between ages 19 and 21, controlling for an array of covariates. The study sample included 2,207 young women who had completed a high school diploma or GED by age 19 and who participated in three NYTD interviews at ages 17, 19 and 21. Childbirth between ages 19 and 21 was linked to decreased access to postsecondary education. However, no relationship was found between access to postsecondary education and childbirth by age 17 or childbirth between ages 17 and 19. Implications for policy, practice and research are discussed.     

Recent changes in the child welfare system: One state's experience

Nationwide over the past 5 years there has been a substantial reduction in the number of children involved with the child welfare system entering out-of-home care as well as a reduction in the lengths of stay among those who do enter the system. This article compares national data on children entering out-of-home care and the length of stay with data from Florida over a 7-year period (2005–2011). Findings are shared on the strategies and services that stakeholders in one state reported as contributing to preventing out-of-home placements and reducing lengths of stay in residential settings. Federal policies such as IV-E Waivers that support this reduction also are discussed. The article concludes with policy and research recommendations regarding how to sustain this reduction while ensuring that child safety and well-being are preserved.     

苏俄时期的穆斯林生活：东干人的个案

这是作者上世纪80年代撰写的有关中亚东干人的田野民族志,可以说是英文作品中研究东干人的先行之作,内容涉及东干人的分布、来源、农庄、语言、饮食、服饰、婚姻及家庭、民居、宗教、个性和民族主义等。通过对上述内容的铺陈,反思东干人的未来。文中提出的东干人的历史记忆、民族认同、族群关系、语言和宗教等问题,经过近三十年的变迁,似乎有了新的答案,可以进行历时性的比较研究。