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31.
Yoonsun Choi Tracy W. Harachi Mary Rogers Gillmore Richard F. Catalano 《Journal of research on adolescence》2005,15(4):505-534
The development of preventive interventions targeting adolescent problem behaviors requires a thorough understanding of risk and protective factors for such behaviors. However, few studies examine whether different cultural and ethnic groups share these factors. This study is an attempt to fill a gap in research by examining similarities and differences in risk factors across racial and ethnic groups. The social development model has shown promise in organizing predictors of problem behaviors. This article investigates whether a version of that model can be generalized to youth in different racial and ethnic groups (N=2,055, age range from 11 to 15), including African American (n=478), Asian Pacific Islander (API) American (n=491), multiracial (n=442), and European American (n=644) youth. The results demonstrate that common risk factors can be applied to adolescents, regardless of their race and ethnicity. The findings also demonstrate that there are racial and ethnic differences in the magnitudes of relationships among factors that affect problem behaviors. Further study is warranted to develop a better understanding of these differential magnitudes. 相似文献
32.
To analyze bivariate time‐to‐event data from matched or naturally paired study designs, researchers frequently use a random effect called frailty to model the dependence between within‐pair response measurements. The authors propose a computational framework for fitting dependent bivariate time‐to‐event data that combines frailty distributions and accelerated life regression models. In this framework users can choose from several parametric options for frailties, as well as the conditional distributions for within‐pair responses. The authors illustrate the flexibility that their framework represents using paired data from a study of laser photocoagulation therapy for retinopathy in diabetic patients. 相似文献
33.
George S. Tavlas Danny M. Leipziger Dae Choi Victor Filatov 《Journal of Policy Modeling》1981,3(1):1-18
This paper examines Federal Reserve Board policies that are premised on a negative short-run association of interest rate movements and the rate of inflation. In particular, econometric evidence is provided, supporting the view that tighter monetary policy appears to raise inflation rates in the short run. Conversely, it is demonstrated that easier monetary policy does not necessarily raise inflation rates in the short run. In the case of uncoordinated monetary restrictiveness, interest rate competition among major countries can produce higher inflation and lower growth than was originally intended. 相似文献
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Well-known estimation methods such as conditional least squares, quasilikelihood and maximum likelihood (ML) can be unified via a single framework of martingale estimating functions (MEFs). Asymptotic distributions of estimates for ergodic processes use constant norm (e.g. square root of the sample size) for asymptotic normality. For certain non-ergodic-type applications, however, such as explosive autoregression and super-critical branching processes, one needs a random norm in order to get normal limit distributions. In this paper, we are concerned with non-ergodic processes and investigate limit distributions for a broad class of MEFs. Asymptotic optimality (within a certain class of non-ergodic MEFs) of the ML estimate is deduced via establishing a convolution theorem using a random norm. Applications to non-ergodic autoregressive processes, generalized autoregressive conditional heteroscedastic-type processes, and super-critical branching processes are discussed. Asymptotic optimality in terms of the maximum random limiting power regarding large sample tests is briefly discussed. 相似文献
36.
Ryan Allen Kimberly M. Horner Jung Ho Choi 《International migration (Geneva, Switzerland)》2023,61(6):58-74
The relationship between refugee investments in human capital and short-run economic outcomes may influence the extent to which refugees invest in human capital that is associated with positive future economic mobility. Using data from the Annual Survey of Refugees from 2016 and 2017 we assess the relationship between recent investments in human capital and hourly wages for employed refugees in the United States. Results suggest that recent job training has a positive effect on hourly wages. In contrast, enrollment in English classes and educational programmes have no short-term positive effects on hourly wages. When combined with the pressure resettled refugees experience to find employment quickly, these results suggest that the lack of short-term wage benefits from English language or educational courses may dissuade refugees from sufficiently investing in the amount of English language or education necessary to promote positive long-term economic mobility. 相似文献
37.
Choi JK 《The Social service review》2010,84(4):655-677
With dramatic growth in nonrmarital births, an increasing number of children are growing up in single-mother families. This study examines the relationships among nonresident fathers' parenting and children's behavioral and cognitive development in low-income, single-mother families. It also considers the personal characteristics of the children's single mothers as well as family processes and economic circumstances. Analyses use the first three waves of longitudinal data from a subsample of single and noncohabiting mothers in the Fragile Families and Child Wellbeing Study. Results suggest that nonresident fathers' parenting is indirectly associated with children's behavior problems and cognitive development. The findings further suggest that those estimated associations are transmitted through mothers' parenting. The study also discusses the policy and practice implications of its findings. 相似文献
38.
This study examines how two major U.S. newspapers (The New York Times and The Washington Post) represented North Korea's national image during the two-year period (from 2001 to 2002). According to the findings, The New York Times and Washington Post showed a similar trend in their portrayal of North Korea. An anti-North Korea frame dominated the news coverage of North Korea in both newspapers. Furthermore, this study reveals that most news articles related to North Korea were classified into negative images instead of positive images. 相似文献
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40.
Daeyoung Lim Elena Rantou Jessica Kim Sungwoo Choi Nam Hee Choi Stella Grosser 《Pharmaceutical statistics》2023,22(6):1116-1134
In vitro permeation tests (IVPT) offer accurate and cost-effective development pathways for locally acting drugs, such as topical dermatological products. For assessment of bioequivalence, the FDA draft guidance on generic acyclovir 5% cream introduces a new experimental design, namely the single-dose, multiple-replicate per treatment group design, as IVPT pivotal study design. We examine the statistical properties of its hypothesis testing method—namely the mixed scaled average bioequivalence (MSABE). Meanwhile, some adaptive design features in clinical trials can help researchers make a decision earlier with fewer subjects or boost power, saving resources, while controlling the impact on family-wise error rate. Therefore, we incorporate MSABE in an adaptive design combining the group sequential design and sample size re-estimation. Simulation studies are conducted to study the passing rates of the proposed methods—both within and outside the average bioequivalence limits. We further consider modifications to the adaptive designs applied for IVPT BE trials, such as Bonferroni's adjustment and conditional power function. Finally, a case study with real data demonstrates the advantages of such adaptive methods. 相似文献