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171.
This study is mainly concerned with estimating a shift parameter in the two-sample location problem. The proposed Smoothed Mann–Whitney–Wilcoxon method smooths the empirical distribution functions of each sample by using convolution technique, and it replaces unknown distribution functions F(x) and G(x ? Δ0) with the new smoothed distribution functions F s (x) and G s (x ? Δ0), respectively. The unknown shift parameter Δ0 is estimated by solving the gradient function S n (Δ) with respect to an arbitrary variable Δ. The asymptotic properties of the new estimator are established under some conditions that are similar to the Generalized Wilcoxon procedure proposed by Anderson and Hettmansperger (1996). Some of these properties are asymptotic normality, asymptotic level confidence interval, and hypothesis testing for Δ0. Asymptotic relative efficiency of the proposed method with respect to the least squares, Generalized Wilcoxon and Hodges and Lehmann (1963) procedures are also calculated under the contaminated normal model. 相似文献
172.
Kelly PJ Sylvia E Schwartz L Cobb AK Veal K 《Journal of psychosocial nursing and mental health services》2006,44(6):31-36
Photography projects are an alternative teaching method that can be easily integrated into community programs with adolescents and children. This article provides a brief review of the use of photography in documenting social and health issues. Two examples of community photography projects with easily ignored populations are described. These projects gave a voice to participants and allowed them to demonstrate their creativity with cameras. An implementation guide is presented to provide concrete suggestions for implementing community photography projects. 相似文献
173.
Time-to-event data such as time to death are broadly used in medical research and drug development to understand the efficacy of a therapeutic. For time-to-event data, right censoring (data only observed up to a certain point of time) is common and easy to recognize. Methods that use right censored data, such as the Kaplan–Meier estimator and the Cox proportional hazard model, are well established. Time-to-event data can also be left truncated, which arises when patients are excluded from the sample because their events occur before a specific milestone, potentially resulting in an immortal time bias. For example, in a study evaluating the association between biomarker status and overall survival, patients who did not live long enough to receive a genomic test were not observed in the study. Left truncation causes selection bias and often leads to an overestimate of survival time. In this tutorial, we used a nationwide electronic health record-derived de-identified database to demonstrate how to analyze left truncated and right censored data without bias using example code from SAS and R. 相似文献
174.
Sei Eun Kim Zhenqiang Zhao Sylvia H. M. Wong Russell B. Toomey 《Journal of research on adolescence》2023,33(2):458-468
Guided by the integrative model, this study investigated the moderating effect of East Asian American youth-reported (N = 143) racial-ethnic socialization (RES) in the relationship between the youth's experiences of discrimination and internalization of the model minority myth. The results suggest that there was a significant interaction between youth's racial discrimination and youth-reported awareness of discrimination on youth's internalization of the model minority myth (b = 3.52, p < .05). No significant interaction effect emerged between racial discrimination and maintenance of heritage culture on internalization of model minority myth. The findings offer several contributions to inform research, family, and communities in understanding the ways caregivers respond to youth's racialized settings, which also contribute to youth's positive outcomes. 相似文献