An empirical likelihood ratio based goodness-of-fit test for skew normality

In this paper, an empirical likelihood ratio based goodness-of-fit test for the skew normality is proposed. The asymptotic results of the test statistic under the null hypothesis and the alternative hypothesis are derived. Simulations indicate that the Type I error of the proposed test can be well controlled for a given nominal level. The power comparison with other available tests shows that the proposed test is competitive. The test is applied to IQ scores data set and Australian Institute of Sport data set to illustrate the testing procedure.     

Comparison of Support Vector Machines to Other Classifiers Using Gene Expression Data

The efficiency of independent controling variates in simulation of activity networks will be evaluated in the sense of mean square deviation of the estimator from the true value. The given result is asymptotic     

Coping and Post-traumatic Stress after Hurricanes Katrina and Rita: Racial Disparities in Social Work Student-Practitioners

ABSTRACT

Recent hurricanes have focused on lives and properties lost, however, additional mental health concerns may emerge in these post-disaster settings. Post-traumatic stress symptoms (PTSS) are particularly problematic for minorities due to pre-disaster disparities. Scholars must thus examine the antecedents of PTSS to support these and other vulnerable individuals and communities. This study examined racial disparities regarding active and avoidant coping, prayer, and subsequent relative contribution of each to PTSS following Hurricanes Katrina and Rita among social work student-practitioners. Using secondary data, results revealed that minority students (n = 233) used coping via prayer more often than their non-minority peers (n = 124; t = 7.18, p < .000; d = 0.76). Moderate, positive relationships emerged between avoidant coping and PTSS for both groups (r = .58–.63, p<.01), though prayer did not emerge as inversely related to PTSS as anticipated. Avoidant coping accounted for the largest variation in PTSS for both groups (β = .35–.51, p<.001). Sampling, survey methods, and PTSS measures limit generalizability and temper findings. Directions for future research include use of PTSS measures that account for severity and cultural context and examination of coping measure psychometrics. Practice implications include enhanced publicity regarding social services available to student-practitioners on college campuses and within the community.     

Design considerations in clinical trials with cure rate survival data: A case study in oncology

For clinical trials with time‐to‐event as the primary endpoint, the clinical cutoff is often event‐driven and the log‐rank test is the most commonly used statistical method for evaluating treatment effect. However, this method relies on the proportional hazards assumption in that it has the maximal power in this circumstance. In certain disease areas or populations, some patients can be curable and never experience the events despite a long follow‐up. The event accumulation may dry out after a certain period of follow‐up and the treatment effect could be reflected as the combination of improvement of cure rate and the delay of events for those uncurable patients. Study power depends on both cure rate improvement and hazard reduction. In this paper, we illustrate these practical issues using simulation studies and explore sample size recommendations, alternative ways for clinical cutoffs, and efficient testing methods with the highest study power possible.     

DO RACE AND ETHNICITY MATTER AMONG FRIENDS?

Using the National Longitudinal Study of Adolescent Health (or Add Health), a nationally representative sample of adolescents in 1994–1995, we examine if and how friendship activities differ among interracial, interethnic, and interethnic friendships of white, black, Hispanic, and Asian youths. We find that best friends are more likely than higher-order friends to be from the same ethnic group and that best friends report more shared activities during the past week than do their higher-order friendship counterparts. Hence, we argue that shared activities is a useful indicator of friendship intimacy. In general, interracial friends report fewer shared activities than do intraracial friends, although this difference is strongest for white respondents. Moreover, we find that white, Asian, and Hispanic youths all report fewer activities with their black friends. We find little difference in friendship activities between interethnic and intraethnic friendships. Our findings suggest that, even when youths manage to break racial boundaries in friendship selection, these friendships face greater challenges than do those between individuals of the same race.     

Resistance in Marital Therapy*

This paper offers a conceptual approach as well as examples of resistance to marital therapy. It is aimed at beginning marital clinicians to provide an understanding of the natural existence of resistance to therapeutic change. A model which conceptualizes resistance based on two divergent emotions is presented. This model can aid the clinician in assessing each individual's willingness to improve throughout the process of therapy. The examples of marital resistance may aid clinicians to be more aware of the forms which resistance can take.     

Alternative methods for handling attrition: an illustration using data from the Fast Track evaluation

Using data from the evaluation of the Fast Track intervention, this article illustrates three methods for handling attrition. Multiple imputation and ignorable maximum likelihood estimation produce estimates that are similar to those based on listwise-deleted data. A panel selection model that allows for selective dropout reveals that highly aggressive boys accumulate in the treatment group over time and produces a larger estimate of treatment effect. In contrast, this model produces a smaller treatment effect for girls. The article's conclusion discusses the strengths and weaknesses of the alternative approaches and outlines ways in which researchers might improve their handling of attrition.     

Debt,precarity and gender: male and female temporary labour migrants in Singapore

As one of Asia’s key hubs for transient workers, Singapore’s migration regime creates particularly gendered streams of labour, especially among lower skilled occupations, as is apparent in two key sectors – domestic work and construction work. Drawing on surveys with Bangladeshi construction workers and Indonesian domestic workers based in Singapore, as well as in-depth interviews with each group, this paper examines gendered issues of temporary labour migration, precarity and risk, as they occur against a backdrop of migrant indebtedness. In this paper, we argue that migrant indebtedness occurs along a spectrum that ranges from less visible, or what we call ‘silently’ incurred forms of debt, through to more ‘resonant’ types of debt that are acquired upfront and thus more readily quantifiable. Using this spectrum of migrant indebtedness, we aim to complicate debates about debt-financed migration by underscoring the ways in which notions of debt and unfreedom can be imbricated with both constraints and opportunities for migrants’ agency.     

TRADE-INDUCED SKILL POLARIZATION

We study how wage gaps across skills and the skill distribution in an economy respond to trade integration. Using administrative data of Denmark (1995–2011), we find that trade has a negative effect on the wage gap between secondary and primary education and a positive effect on the wage gap between tertiary and secondary education. We also show that trade affects skill distribution and induces skill polarization: trade has a positive effect on both the mean and standard deviation of skills. Wage-gap changes induced by trade shocks explain about 21%–30% of the effect of trade on skills.