Biased Bootstrap Methods for Reducing the Effects of Contamination

Contamination of a sampled distribution, for example by a heavy-tailed distribution, can degrade the performance of a statistical estimator. We suggest a general approach to alleviating this problem, using a version of the weighted bootstrap. The idea is to 'tilt' away from the contaminated distribution by a given (but arbitrary) amount, in a direction that minimizes a measure of the new distribution's dispersion. This theoretical proposal has a simple empirical version, which results in each data value being assigned a weight according to an assessment of its influence on dispersion. Importantly, distance can be measured directly in terms of the likely level of contamination, without reference to an empirical measure of scale. This makes the procedure particularly attractive for use in multivariate problems. It has several forms, depending on the definitions taken for dispersion and for distance between distributions. Examples of dispersion measures include variance and generalizations based on high order moments. Practicable measures of the distance between distributions may be based on power divergence, which includes Hellinger and Kullback–Leibler distances. The resulting location estimator has a smooth, redescending influence curve and appears to avoid computational difficulties that are typically associated with redescending estimators. Its breakdown point can be located at any desired value ε∈ (0, ½) simply by 'trimming' to a known distance (depending only on ε and the choice of distance measure) from the empirical distribution. The estimator has an affine equivariant multivariate form. Further, the general method is applicable to a range of statistical problems, including regression.     

限制网络营销发展的若干因素分析

随着INTERNET的发展 ,一种全新的营销理论 -网络营销已经扑面而来。但在现有的中国市场条件下 ,其发展并不顺利 ,本文就从几个角度对限制网络营销发展的因素进行分析 ,为企业制定网络营销方案 ,提供借鉴     

借鉴国外成功经验 探究创建“人文廊坊”的途径及对策

现代化城市的建设越来越注重以人为本、尊重人文的发展理念。＂人文廊坊＂建设目标的提出符合时代潮流且意义深远。分析国外城市在人文建设方面的特点、总结其成功经验,能够在实现途径方面为创建＂人文廊坊＂提供有益参考。     

Brand alliance and event management for social causes: Evidence from New Zealand

This paper uses findings from research on the effectiveness of a New Zealand health promotion program to make two arguments. The first is that, in appropriate cases such as this program, event management can play a key role in a social marketing health promotion campaign. In showing how event management added value to achieving that particular program's goals, it argues that event management could often be a valid and effective part of the mix for other campaigns promoting social causes. The second highlights important issues that can arise in relationships between non-profit organizations and the commercial sponsors of their events. It contends that organisers of campaigns for social causes need to be alert to the risks in brand alliances between such organizations and need to consider not only the appropriateness of the fit but also the need for an appropriate balance between the sponsor's commercial interests and the non-profit organization's goal.     

买方市场条件下的企业营销对策

买方市场的形成是我国经济发展过程的一个划时代变化，它将对我国企业经营和营销带来严峻挑战。本文分析了我国买方市场的形成、特征及其对企业营销的影响，并就买方市场条件下企业营销对策进行了重点分析。     

Department of Health Research Overviews – Past, Present and Future: An evaluation of the dissemination of the Blue Book, Child Protection: Messages from Research

Since 1985 the Department of Health has been providing child care research overviews as a means of bringing together the findings of its funded research programmes. With each successive publication a pattern of design and dissemination has emerged. This is illustrated by Child Protection: Messages from Research ( Department of Health 1995 ), an overview of 20 studies of child protection. It included an introductory essay, summaries of each project and a set of 'True for Us' exercises. Publication was followed by national seminars and widespread distribution of free copies. Given the substantial investment, it seems timely to assess the impact of the dissemination process in terms of reaching and affecting practice. The survey sought to assess awareness, use and opinions of the report from social services, education and health professionals. It consisted of questionnaires administered by post and telephone calls to a representative sample of 600 professionals working in child protection, 292 of whom replied. The results demonstrate that the book is very well known among most professionals working in child welfare, particularly in social services, and is perceived to have affected the practice of over half of the respondents. The study supports the structure adopted for the report but suggests further benefits in employing a variety of dissemination strategies for different professional groups. Finally, the paper discusses the relationship between overviews and evidence-based services.     

Ethics of research design

Discussions of ethical issues in research involving human subjects most usually provoke concerns about valid informed consent procedures. However, considering the recognized limitations of informed consent, arguably the way a study is designed is a more consequential concern for subject well‐being. This paper summarizes ethical issues in the design of clinical research, with reference to historic and current guidelines. Special attention is given to randomized clinical trials (RCTs) and psychiatric research.     

Generation of multivariate distributions by vertical density representation

Troutt (1991,1993) proposed the idea of the vertical density representation (VDR) based on Box-Millar method. Kotz, Fang and Liang (1997) provided a systematic study on the multivariate vertical density representation (MVDR). Suppose that we want to generate a random vector X[d]Rⁿthat has a density function ?(x). The key point of using the MVDR is to generate the uniform distribution on [D]_?(v) = {x :?(x) = v} for any v > 0 which is the surface in RⁿIn this paper we use the conditional distribution method to generate the uniform distribution on a domain or on some surface and based on it we proposed an alternative version of the MVDR(type 2 MVDR), by which one can transfer the problem of generating a random vector X with given density f to one of generating (X, X_n+i) that follows the uniform distribution on a region in Rⁿ⁺¹defined by ?. Several examples indicate that the proposed method is quite practical.     

面对个人品牌营销的媒体博弈

大众传媒发布的有关个人品牌的信息，表达了大众传媒与个人品牌营销双方共同的利益诉求和工具理性，但在双方的互动中也存在着话语权的隐性之争，个人或者公关组织试图通过自己握有的市场权力操纵传媒，掌控“新闻营销”活动。大众传媒首先要进行自我的博弈，自我的博弈结果决定着与个人品牌营销的博弈结果。     

Linking the university and the social agency in collaborative evaluation research: principles and examples

This paper presents an analysis of components of successful social work evaluation research practice. Among the key obstacles to successful evaluations of social work intervention are the impoverished knowledge base on which many social work interventions are based, the isolation of researchers and practitioners in the conduct of evaluations, and during research implementation failure to cope with the changing field context. To remedy this situation social work needs to invest in university and social agency partnerships focussed on knowledge building for the profession. In such partnerships the traditional roles of the researcher and the practitioner are altered so that shared responsibility for knowledge development is possible. In addition, to deal with changing field contexts the research team needs to be continuously engaged in problem solving and redesign. An initial example of such a partnership is described together with a case study illustrating implementation of a multi-site field experiment evaluation.