The zero-inflated Poisson model and the decayed, missing and filled teeth index in dental epidemiology

For frequency counts, the situation of extra zeros often arises in biomedical applications. This is demonstrated with count data from a dental epidemiological study in Belo Horizonte (the Belo Horizonte caries prevention study) which evaluated various programmes for reducing caries. Extra zeros, however, violate the variance–mean relationship of the Poisson error structure. This extra-Poisson variation can easily be explained by a special mixture model, the zero-inflated Poisson (ZIP) model. On the basis of the ZIP model, a graphical device is presented which not only summarizes the mixing distribution but also provides visual information about the overall mean. This device can be exploited to evaluate and compare various groups. Ways are discussed to include covariates and to develop an extension of the conventional Poisson regression. Finally, a method to evaluate intervention effects on the basis of the ZIP regression model is described and applied to the data of the Belo Horizonte caries prevention study.     

转基因生物安全立法的动力、压力、阻力探析

法律的制定是一系列力量共同作用的结果,其中既有动力,也有压力和阻力。认真厘清和分析转基因生物安全立法的动力、压力和阻力,有利于推进转基因生物安全的立法进程、提高转基因生物安全法的立法质量。     

Reflective Practices for Engaging in Trauma-Informed Culturally Competent Supervision

ABSTRACT

Race, ethnicity, and culture are critical components that affect and shape the supervisory relationship, yet literature about ways to acknowledge and actively engage them from a trauma-informed approach has been limited. To enhance the discussion of this issue, this article first reviews leading theoretical aspects of supervision designed to train practitioners in the field of mental health, followed by a discussion of race, ethnicity, and culture in supervision and, finally, provides reflective practices for engaging in trauma-informed culturally competent supervision.     

Estimating the error distribution function in semiparametric additive regression models

We consider semiparametric additive regression models with a linear parametric part and a nonparametric part, both involving multivariate covariates. For the nonparametric part we assume two models. In the first, the regression function is unspecified and smooth; in the second, the regression function is additive with smooth components. Depending on the model, the regression curve is estimated by suitable least squares methods. The resulting residual-based empirical distribution function is shown to differ from the error-based empirical distribution function by an additive expression, up to a uniformly negligible remainder term. This result implies a functional central limit theorem for the residual-based empirical distribution function. It is used to test for normal errors.     

A Test of Excellent Leadership in Public Relations: Key Qualities,Valuable Sources,and Distinctive Leadership Perceptions

To better understand leadership in public relations and explore its value in successful communication management, this article captured the perceptions of mid- and senior-level public relations executives (N = 222) regarding the important qualities and dimensions of excellent leadership in the practice. According to study participants, strategic decision-making capability, problem-solving ability, and communication knowledge and expertise are the three most important qualities of excellent leadership. In addition, respondents said that on-the-job experiences, individual initiative and desire, and role models are the most valuable sources of leadership skills and development. About half of the respondents indicated that excellent leaders in public relations are different from leaders in other fields in three ways: They must hold a compelling vision for communication, possess comprehensive understanding of media and information systems, and effectively develop and implement strategic communication plans. Professional women and men in the study viewed excellent leadership in more or less similar ways. The study advances understanding of leadership in the field, which has been little explored in the public relations literature.     

Sorting people out: The uses of one-dimensional classificatory schemes in a multi-dimensional world

This paper examines how people are classified as part of a labour market project aimed at establishing a process for recognizing prior learning among immigrants to Sweden in order to integrate them more quickly with the labour market and society. The paper suggests that, in Sweden, this work prioritizes procedural effectiveness over a more comprehensive understanding of the competence and qualifications of the immigrant worker. By exploring the process of classification in which cognitive structuring of the perceived world results in organizational, administrative and structural enactment, the study provides further insights into how practices of classification are a central part of organizational life. The concept of intersectionality contributes by showing how individuals are situated at the intersection of a variety of classificatory schemes, and together with classification, intersectionality points to how organizational categories are never given, but a result of bureaucratic power procedures strengthening, weakening and/or negotiating away categories used to sort people out.     

Waivers of parental consent for sexual minority youth

ABSTRACT

The Society for Adolescent Health and Medicine emphasizes the need for research to focus on the health outcomes of sexual minority youth (i.e., lesbian, gay, bisexual, transgender, queer). However, sexual minority youth (SMY) are often less willing to participate in research studies where parental consent is required due to potential victimization and discrimination. This is a major concern given that more research is needed to understand the health needs of this population, especially in terms of suicide, substance use, and HIV prevention. The National Suicide Prevention Strategy classifies SMY as a high-risk group, emphasizing the need to explore suicide risks (along with other health outcomes) among this group. However, this high-risk classification also increases the safeguards necessary to conduct research with this population. Many researchers have argued for waivers of parental consent, but such waivers present with several ethical implications. This article discusses ethical principles, risks, benefits, safeguards, and potential alternative approaches to waivers of parental consent for SMY. We conclude by emphasizing the need for policy changes to allow parental consent waivers for research targeting SMY.     

Identifying and controlling for program-level differences in comparative cost analysis: lessons from the economic evaluation of the National Breast and Cervical Cancer Early Detection Program

Performing economic evaluations of established health care programs is essential to identify and control for underlying program-level variations and to make valid comparisons. At a time when the need for such evaluations is growing, health care professionals have limited information on the methodological challenges of performing these evaluations. In this study, we used the National Breast and Cervical Cancer Early Detection Program to illustrate these potential underlying variations. We performed site visits to four grantees and collected activity-based cost data from nine additional representative programs. We identified five specific types of cost factors that should be considered when evaluating and comparing health care programs: clinical services, service mix, in-kind contributions, indirect costs, and year-to-year expenditures of specific activities. A key lesson is that case studies and pilot testing should be performed before initiating cost analysis to identify underlying variation and to test appropriate methods to adequately control for these differences.     

论竞优及其管理

在阐述竞优行为及竞优思想的基础上,提出了竞优内核的概念,并分析了竞优内核的特性,指出了竞优活动的6个特点,对竞优管理的主要内容和流程进行了分析和阐述。研究表明,竞优是以认识和利用事物规律为前提,以知识为驱动,以展示行为主体优良为目的的一种主流行为;竞优观念可以改善人们认识事物的角度;差异性是竞优的必然现象,而多元化则是竞优群体的某种类型选择结果;竞优能够有效提升行为主体的社会价值,并促进社会组织的发展;建立健全民主集中制是竞优管理的基本要求。     

管理者关系特性对海外子公司知识获取及公司绩效的影响研究

基于组织学习理论和社会资本理论,考察了管理者关系特性对海外子公司内外部网络知识获取和企业绩效的影响。研究结果显示,母子公司管理者之间的信任和沟通频率对获取母公司知识有正向影响,海外子公司管理者和本地重要企业管理者之间的信任对获取本地商务知识有正向影响,海外子公司管理者和本地政府主要负责人之间的私人关系对获取本地制度知识有显著影响。此外,本地制度知识在母公司知识对海外子公司绩效的影响中起正向调节作用,本地商务知识起负向调节作用。