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991.
It is often necessary to test whether X,…, Xn are from a certain density f(x) or not. Most test statistics such as the Kolmogorov-Smirnov, Cramer-von Mises, and Anderson-Darling statistics are based on the empirical distribution function F(x). In this paper we suggest a test statistic based on the integrated squared error of the kernel density estimator. We derive the asymptotic distribution of the statistic under the null and alternative hypothesis. Some simulation results for power comparisons are also given. 相似文献
992.
In semiconductor manufacturing, wafer fabrication is the most complicated and important process, and is composed of several hundred process steps and involves several hundred machines. The productivity of the manufacturing process depends mainly on controlling the balance of WIP (work-inprogress) flow to achieve maximum throughput under short manufacturing cycle times. This paper discusses how to determine the proper WIP level for operations, against which balance status can be measured. Balance measurement can be applied in mathematical modelling for bottleneck scheduling and operations management of the fabrication line. Performances are evaluated through computational experiments to show that balance driven management leads to 15-33% more production in 21% shorter manufacturing cycle time than production driven management. 相似文献
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Kristen Shook Slack Lawrence M. BergerKimberly DuMont Mi-Youn YangBomi Kim Susan Ehrhard-DietzelJane L. Holl 《Children and youth services review》2011,33(8):1354-1363
The present analysis relies upon data from three separate longitudinal studies to identify risk and protective factors associated with subsequent neglect during early childhood. All three studies (Fragile Families and Child Wellbeing [FFCW]; Healthy Families New York [HFNY]; Illinois Families Study-Child Wellbeing [IFS]) involve probabilistic samples or subsamples of low-income families with young children. Multivariate logistic regressions predicting official reports of investigated neglect allegations and a dichotomous indicator of neglect from the Parent-child Conflict Tactics Scale (CTS-PC) were conducted separately for each study, using common sets of predictors derived from baseline or initial survey waves. Across the three studies, consistencies emerged with respect to the predictors of both neglect outcomes. Specifically, consistencies emerged related to indicators of economic resources and hardships, parent well-being, and parenting. Understanding the predictors of child neglect is of critical importance to the development of child maltreatment prevention strategies since a clearer understanding of the risk and protective factors associated with neglect would enable more effectively targeted and tailored interventions. 相似文献
995.
The current study examined the relationship between suicidal behaviors and physical and psycho-social predictors including
body image, weight control behaviors, and risky sexual behaviors among Asian, African American, Caucasian, and Hispanic adolescents.
This study used the 2007 Youth Risk Behavior Survey (YRBS). The target populations were 11,134 adolescents (5,636 female and
5,498 male) in 9th–12th grade who completed the survey. A linear regression was conducted to examine the correlation between
predictors and suicidal behaviors. The results showed that gender, grade, depression, substance use, body image, weight control
behaviors, and risky sexual behaviors were significant predictors of adolescents’ suicidal behaviors, while race/ethnicity
was not a good predictor. Also, there were significant gender and grade differences in suicidal behaviors. Based on the results,
practice implications for suicide prevention were discussed. 相似文献
996.
To address the early performance gap between native-born and immigrant children and to seek ways to reduce the disparity, the study explored the effect of teacher qualification on early math skills of preschoolers, with focused attention to immigrant children. Particularly, the study examined the effects of teacher educational levels, certification, and professional training, by employing Hierarchical Linear Modeling (HLM) analysis to a US nationally representative database from the Head Start Family and Child Experiences (FACES). The study found a significantly positive effect of teacher qualification for immigrant preschoolers in Head Start, who displayed lower early math skills than their native-born counterparts. Among immigrant preschoolers, those who were with teachers of lower educational levels showed significantly lower early math skills compared with their immigrant peers with teachers of higher educational levels. The study also supported teacher certification and professional training as potential mediators in promoting early math competency of immigrant students, especially with teachers of lower educational levels. 相似文献
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