A class of partially linear single‐index survival models

The authors define a class of “partially linear single‐index” survival models that are more flexible than the classical proportional hazards regression models in their treatment of covariates. The latter enter the proposed model either via a parametric linear form or a nonparametric single‐index form. It is then possible to model both linear and functional effects of covariates on the logarithm of the hazard function and if necessary, to reduce the dimensionality of multiple covariates via the single‐index component. The partially linear hazards model and the single‐index hazards model are special cases of the proposed model. The authors develop a likelihood‐based inference to estimate the model components via an iterative algorithm. They establish an asymptotic distribution theory for the proposed estimators, examine their finite‐sample behaviour through simulation, and use a set of real data to illustrate their approach.     

Approximating bayesian inference by weighted likelihood

The author proposes to use weighted likelihood to approximate Bayesian inference when no external or prior information is available. He proposes a weighted likelihood estimator that minimizes the empirical Bayes risk under relative entropy loss. He discusses connections among the weighted likelihood, empirical Bayes and James‐Stein estimators. Both simulated and real data sets are used for illustration purposes.     

A robust prediction error criterion for pareto modelling of upper tails

Estimation of the Pareto tail index from extreme order statistics is an important problem in many settings. The upper tail of the distribution, where data are sparse, is typically fitted with a model, such as the Pareto model, from which quantities such as probabilities associated with extreme events are deduced. The success of this procedure relies heavily not only on the choice of the estimator for the Pareto tail index but also on the procedure used to determine the number k of extreme order statistics that are used for the estimation. The authors develop a robust prediction error criterion for choosing k and estimating the Pareto index. A Monte Carlo study shows the good performance of the new estimator and the analysis of real data sets illustrates that a robust procedure for selection, and not just for estimation, is needed.     

长周期光纤光栅研究现状分析

光纤光栅在光纤通信和光纤传感等领域有着广泛的应用,其中长周期光纤光栅是近年来光纤光栅研究领域的热点之一．该文在总结长周期光纤光栅研究现状的基础上,着重介绍了高频CO2激光脉冲写入长周期光纤光栅的新方法。     

论远程教育中多媒体教学资源的应用效果

分析和评价了我国现代远程教育多媒体教学资源的现状和应用效果,针对多媒体教学资源中存在的问题,提出以学生为中心的理念,对多媒体教学资源进行开发设计;用开放性原则来进一步完善多媒体教学资源的建设;从最优化组合的要求对现有的多媒体教学资源进行整合。     

Fathering in intact and divorced families: Ethnic differences in retrospective reports

The present study was designed to investigate whether ethnicity moderates the effects of divorce on young adults’ retrospective reports of fathering. An ethnically diverse sample of 1,989 university students completed measures of nurturant fathering, reported father involvement, and desired father involvement. Compared with participants from intact families, those from divorced families indicated lower levels of nurturant fathering and reported father involvement. These differences varied considerably by ethnicity. Reported fathering differences between participants from intact and divorced families were greatest in African Americans, Caribbean Islanders, and foreign‐born Cubans. These differences were smallest in non‐Hispanic Whites and Asians. Participants from divorced families reported greater levels of desired father involvement than did participants from intact families. These differences were not moderated by ethnicity.     

Child Support Obligations and Low‐Income Fathers

Using the 1994–1998 waves of the Current Population Survey—Child Support Supplement (N =5,387), the aims of this study are to document child support obligation rates of nonresident fathers, to examine the effect of the obligation rate on child support compliance, and to calculate the trade‐off between fathers’ financial responsibility and children's well‐being, paying particular attention to low‐income fathers. The results indicate that low‐income fathers have high child support obligation rates, which significantly reduce their child support compliance. Although lowering the obligation rate for these fathers may improve their compliance, it does not fully offset the lowered obligation amounts and leads to a 30% net payment loss for welfare mothers and a 43% loss for nonwelfare mothers. Policy implications are discussed.     

发展远程教育是实现西部地区教育腾飞的必然选择

随着计算机技术、网络技术和电子通信技术的迅速发展和应用,带来教育信息资源的极大丰富和教育手段的多样化.要实现西部地区的经济腾飞,必须使其教育腾飞,要使教育腾飞,必须解放思想,勇于创新,改变传统教育模式,大力发展远程教育是必然选择.     

Family Provisions at the Workplace and Their Relationship to Absenteeism,Retention, and Productivity of Workers: Timely Evidence from Prior Data

Using data from the Australian Workplace Industrial Relations Survey, this study provides timely evidence on the effects of on‐site child care at the workplace and employer‐provided family leave on worker absenteeism, turnover, and productivity. The study found that workplaces with on‐site child care compared with workplaces with no on‐site child care had lower rates of absenteeism and higher ratings for worker productivity. Workplaces that had a family leave policy also had lower rates of absenteeism than workplaces that had no such policy in place. Analyses also suggest that workplace characteristics, such as presence of a human‐resources manager or union representative, are associated with higher worker productivity. Firm size, mission, and shift work were other predictors of worker performance. The findings argue strongly for an extensive, new workplace survey that can elucidate how parents today manage to abide by new workplace agreements while still handling the demands of family life.     

Alcohol Use and Prior Substance Abuse Treatment in Relation to Gambling Problem Severity and Gambling Treatment Outcome

Recent research has made it clear that problematic gambling is often accompanied by problematic alcohol use. Unfortunately, little is known about the nature of this association, especially as it relates to gambling treatment outcome. The purpose of this study is to explore the effect of current alcohol use level and previous substance abuse treatment on the symptoms of a large cohort of pathological gamblers as well as on their response to treatment for pathological gambling. The sample included 464 men and 301 women recruited at six gambling treatment programs in Minnesota. Gambling treatment patients were assessed on a number of gambling problem severity and related clinical variables using the Gambling Treatment Outcome Monitoring System (GAMTOMS). Patients with frequent alcohol use had greater gambling involvement at baseline than infrequent alcohol users. Patients with a previous history of substance abuse treatment had more severe psychosocial problems, ostensibly resulting from their gambling behavior, than patients without past substance abuse treatment. A MANOVA with repeated measures showed that neither pretreatment alcohol use, nor past substance abuse treatment exerted significant effects on gambling treatment outcome. While the level of pretreatment alcohol use and a history of substance abuse treatment are markers for greater gambling problem severity, treatment outcome for pathological gambling was not adversely impacted by these variables.