Cytometry inference through adaptive atomic deconvolution

In this paper, we consider a statistical estimation problem known as atomic deconvolution. Introduced in reliability, this model has a direct application when considering biological data produced by flow cytometers. From a statistical point of view, we aim at inferring the percentage of cells expressing the selected molecule and the probability distribution function associated with its fluorescence emission. We propose here an adaptive estimation procedure based on a previous deconvolution procedure introduced by Es, Gugushvili, and Spreij [(2008), ‘Deconvolution for an atomic distribution’, Electronic Journal of Statistics, 2, 265–297] and Gugushvili, Es, and Spreij [(2011), ‘Deconvolution for an atomic distribution: rates of convergence’, Journal of Nonparametric Statistics, 23, 1003–1029]. For both estimating the mixing parameter and the mixing density automatically, we use the Lepskii method based on the optimal choice of a bandwidth using a bias-variance decomposition. We then derive some convergence rates that are shown to be minimax optimal (up to some log terms) in Sobolev classes. Finally, we apply our algorithm on the simulated and real biological data.     

Bullying and Victimization Among Young Elementary School Children: The Role of Child Ethnicity and Ethnic School Composition

School-aged children with an ethnic minority background are relatively often involved in bullying and victimization, but the role of ethnic composition of schools in this context remains unclear. This study examined the relation between ethnic minority background, ethnic school composition, and bullying behaviour around primary school entry in the Netherlands. The study was based on a 2008/2009 school survey in Rotterdam, a Dutch city where about 50 % of children have a non-Dutch background. For 8523 children, teacher reports of bullying behaviour at age 5–6 years were available. Children with a non-Dutch background had higher odds of being a victim (adjusted OR 1.41, 95 % CI 1.11, 1.80), bully (OR 1.38, 95 % CI 1.20, 1.58) or bully-victim (OR 1.38, 95 % CI 1.19, 1.62) than children of Dutch national origin. Ethnic diversity in schools increased children’s risk of bullying behaviour (e.g. OR_victim per 0.1 increase in 0–1 diversity range = 1.06, 95 % CI 1.00, 1.13), with children of both Dutch and non-Dutch national origin relatively more often involved in bullying in ethnically diverse schools. The proportion of same-ethnic peers in school reduced the risk of bullying among children of Dutch national origin (e.g. OR_victim per 10 % more same-ethnic children = 0.90, 95 % CI 0.83, 0.98), but not among non-Dutch children. In conclusion, ethnic minority background and ethnic diversity within schools are risk factors for bullying among 5–6 year olds. Plausibly, reductions in absolute numbers of bullying events may be obtained with tailor-made interventions in ethnically diverse schools. Such interventions should preferably be offered early in the school curriculum.     

An examination of the role of online social media in journalists’ source mix

Using telephone surveys of business/financial journalists in the United States (n = 200), this research investigates the agenda-building role of social media content in journalists’ work. Understanding that more non-public relations content from user-generated and social network sites, like YouTube and Twitter, are fast becoming resources for journalists to get story ideas, break scandals, and find sources, we began this scholarly work to determine the frequency of such uses of social media. Overall, findings indicate very little use of social media by these business journalists. Results and implications for public relations practitioners are discussed in detail.     

Fetal movements: What are we telling women?

Problem

Information that women receive about the importance of monitoring fetal movements and what to do if there are changes is inconsistent and may not be evidence based.

Changing attitudes about self-injury prevention management: lessons learned

In the behavioral health environment, nurses often use continuous staff monitoring and, at times, physical restraints, to manage the severity of patients' self-injury. Both options put staff in control, are the most restrictive in nature, and can be financially draining on the hospital's budget. This can result in negative reactions by both patients and staff. It is important to develop a program that will empower patients to control their behavior and allow staff to be aware of their perceptions and attitudes toward patients who self-injure. This article describes the leadership initiative that drove the development, training, and implementation of a self-injury prevention project and the lessons learned by staff.     

Le maire en action : gouvernement urbain et production de politiques publiques. Michel Delebarre à Dunkerque

Changes in the French political, administrative system and trends in the economy starting in the 1970s have reshaped power at the municipal level. The figure of the mayor as a “notable” has apparently taken a more entrepreneurial and managerial turn in line with changes in local government, its sources of revenue and contractual procedures. By studying the mayor through the prism of the production of public policy at the local level, this shift can be qualified: the role as a notable is tapped in mobilizing resources, while the dynamic entrepreneurial role comes into play in steering policies, timing interventions and assessing the related risks. The observation of the whole process of producing the two urban policies described in Dunkerque sheds light on how the “municipal team” led by the mayor defines the rules of the game, takes diverging interests into account and maintains an interdependence between the various actors involved in policy-implementation. This article seeks to open a dialog between a case study of a municipal government and the observation of local public policy so as to understand changes in the levers of local power.