Asymptotic normality and mean consistency for the weighted estimator in nonparametric regression models

In this paper, we mainly study the asymptotic properties of weighted estimator for the nonparametric regression model based on linearly negative quadrant dependent (LNQD, for short) errors. We obtain the rate of uniformly asymptotic normality of the weighted estimator which is nearly $O\left(n^{?1∕4}\right)$ when the moment condition is appropriate. The results generalize the corresponding ones of Yang (2003) from NA samples to LNQD samples and improve or extend the corresponding one of Li et al. (2012) for LNQD samples. Moreover, we obtain some results on mean consistency, uniformly mean consistency, and the rate of mean consistency for the weighted estimator. Finally we carry out some simulations to verify the validity of our results.     

More than Money: The Importance of Social Exchanges for Temporary Low-Skilled Migrant Workers’ Workplace Satisfaction

Research has focused on the happiness of immigrants, but the workplace satisfaction of temporary low-skilled migrant workers has rarely been explored. By utilizing survey data for two years, 2010 and 2013, along with interviews with migrant workers, we explored how economic or social factors could trigger diverse impacts on the satisfaction of temporary low-skilled migrant workers in different work environments. Results showed that economic factors triggered more notable impacts in 2010, while the importance of social factors increased with improvements in work environments in 2013. The results indicated that moving motive premises and social exchange theory effectively explain attitudes of temporary low-skilled migrant workers. Theoretical and practical contributions and suggestions of the results are also included.     

Economic Theories of Low-Wage Work

This article examines economic theories of the low-wage labor market to increase understanding of economic inequality and poverty in the United States, particularly related to the labor market. On the one hand, neoclassical, labor monopsony, and Harris-Todaro models explain how minimum wage policies are related to supply and demand of labor, human capital, employment, and unemployment. On the other hand, the efficiency wage model, the dual labor market theory, and technology development and globalization account for the causes of the wage differentials. This article includes a conceptual map that illustrates the interrelationships between these economic theories of low-wage work.     

Simulating the average run length for cusum schemes using variance reduction techniques

Some variance reduction techniques utilizing the total hazard are developed to estimate the average run lengths of the cumulative sum charts through simulation when the process follows a general probability distribution. Particularly, we propose the hazard estimator and the cycle estimator. Simulation results are shown for the exponential case and these estimators are compared with the raw simulation estimator. Applicability to multivariate CUSUM schemes is briefly discussed in the conclusion.     

Planned Happenstance Skills and Occupational Identity Status in High School Students

This study investigated how the 5 components of planned happenstance skills are related to adolescents' occupational identity statuses. A canonical correlation analysis was performed with a sample of 370 high school students in South Korea. The results indicated that higher identity statuses (i.e., achievement and moratorium statuses) were significantly related to the 5 components of planned happenstance skills, whereas lower identity statuses (i.e., foreclosure and diffusion statuses) were not significantly related to the 5 components of planned happenstance skills. In addition, the results of the mediation analysis indicated that the transition from moratorium to achievement status was positively mediated by 3 components of planned happenstance skills: optimism, persistence, and risk taking.     

The lesbian rights movement and feminism in South Korea

The lesbians' rights movement in South Korea has undertaken various projects for solidarity with feminist movement groups for over 10 years. In spite of these efforts, lesbian issues have been blatantly excluded from all the agendas of women's rights. The same thing has happened in Women's Studies. Some feminists express homophobic thoughts without understanding the reality of lesbians, and other young scholars take on a lesbian identity temporarily as a sign of being progressive and liberated; in neither situation are they committed to dealing with the oppression of lesbians or seeing lesbian rights as a feminist concern. In order to further lesbian rights there are two strategies possible: forming a movement only for lesbians or forming solidarity with feminists. In the latter case, a concern about lesbian rights will help achieve the goals of a true feminism as patriarchy is built upon heterosexism. doi:10.1300/J155v10n03_11.     

Regression analysis of competing risks data via semi-parametric additive hazard model

When the subjects in a study possess different demographic and disease characteristics and are exposed to more than one types of failure, a practical problem is to assess the covariate effects on each type of failure as well as on all-cause failure. The most widely used method is to employ the Cox models on each cause-specific hazard and the all-cause hazard. It has been pointed out that this method causes the problem of internal inconsistency. To solve such a problem, the additive hazard models have been advocated. In this paper, we model each cause-specific hazard with the additive hazard model that includes both constant and time-varying covariate effects. We illustrate that the covariate effect on all-cause failure can be estimated by the sum of the effects on all competing risks. Using data from a longitudinal study on breast cancer patients, we show that the proposed method gives simple interpretation of the final results, when the primary covariate effect is constant in the additive manner on each cause-specific hazard. Based on the given additive models on the cause-specific hazards, we derive the inferences for the adjusted survival and cumulative incidence functions.     

Empirical Studies of Child Welfare Training Effectiveness: Methods and Outcomes

Although public child welfare agencies, as well as contracted private providers, conduct extensive amounts of training, the evaluation evidence for effectiveness of training interventions is sparse. This article provides a critical review of published reports of the child welfare training evaluation literature. When we conducted a search of the literature published since 1990, 14 articles met the criteria for inclusion. These articles are reviewed according to: training audience, training duration, research design, sample size, outcome measures, and reported results. Our conclusions identify strengths and weaknesses in evaluation approaches to date and suggest strategies for enhancing the evidence base of this core intervention in child welfare.