Two new defective distributions based on the Marshall–Olkin extension

The presence of immune elements (generating a fraction of cure) in survival data is common. These cases are usually modeled by the standard mixture model. Here, we use an alternative approach based on defective distributions. Defective distributions are characterized by having density functions that integrate to values less than \(1\), when the domain of their parameters is different from the usual one. We use the Marshall–Olkin class of distributions to generalize two existing defective distributions, therefore generating two new defective distributions. We illustrate the distributions using three real data sets.     

When data justice and environmental justice meet: formulating a response to extractive logic through environmental data justice

ABSTRACT

Environmental data justice (EDJ) emerges from conversations between data justice and environmental justice while identifying the limits and tensions of these lenses. Through a reflexive process of querying our entanglement in non-innocent relations, this paper develops and engages EDJ by examining how it informs the work of the Environmental Data & Governance Initiative (EDGI), a distributed, consensus-based organization that formed in response to the 2016 US presidential election. Through grassroots archiving of data sets, monitoring federal environmental and energy agency websites, and writing rapid-response reports about how federal agencies are being undermined, EDGI mobilizes EDJ to challenge the ‘extractive logic’ of current federal environmental policy and data infrastructures. ‘Extractive logic’ disconnects data from provenance, privileges the matrix of domination, and whitewashes data to generate uncertainty. We use the dynamic EDJ framework to reflect on EDGI’s public comment advising against the US Environmental Protection Agency’s proposed rule for Transparent Science. Through EDJ, EDGI aspires to create new environmental data infrastructures and practices that are participatory and embody equitable, transparent data care.     

Financial Planning for Retirement Village Living: A Qualitative Exploration

This Australian exploratory study investigates the financial considerations retirees experienced before moving into a retirement village. A qualitative content analysis was undertaken on the responses of 52 retirement village residents, who were part of a much larger study on retirees’ accommodation choices in 2007. The respondents were grouped according to income, and the results were compared across the following groups (self-funded retirees, part-pension retirees, and full-pension retirees). Differences between the groups extended beyond affordability. Both pension groups were more anxious about the increasing costs of maintenance fees than self-funded retirees, and the importance of pensions and superannuation was also discussed.     

Coverage with k-transmitters in the presence of obstacles

For a fixed integer k≥0, a k-transmitter is an omnidirectional wireless transmitter with an infinite broadcast range that is able to penetrate up to k “walls”, represented as line segments in the plane. We develop lower and upper bounds for the number of k-transmitters that are necessary and sufficient to cover a given collection of line segments, polygonal chains and polygons.     

Adult and child deprivation in Hong Kong

There is growing interest in the application of Townsend's deprivation approach to provide estimates of poverty that more directly reflect the living standards of those on low income. The consensual approach is applied here using data from the second wave (conducted in 2015–2016) of the Trends and Implications of Social Disadvantages in Hong Kong survey. The article draws on a related study that identifies separate lists of items deemed “necessary for all” by a majority of adults (aged 18 years or older) and children (aged 10–17 years). Those unable to obtain at least three of these items are identified as deprived, and the profile of household deprivation is examined in terms of the family types most affected, age groups, and numbers of children. Further analysis focuses on the disparity between children identified as living in households identified as deprived according to information provided by adults and children whose deprivation status reflects their own views. Finally, the overlaps between deprivation and four measures of poverty—two objective and income based and two subjective and perception based—are examined and discussed. The results indicate that deprivation and poverty are different but that, however it is measured, more needs to be done to address poverty in Hong Kong, including further improvements in the coverage and adequacy of health service provision and social security benefits.     

May the force be with you: Looking for resources that build team resilience

The aim of this study is to analyze team resilience as a collective psychosocial construct in the framework of the conservation of resources theory. Specifically, the authors hypothesize that (a) team-level resources and (b) organizational-level healthy practices would be positively related to team resilience. Multilevel regression modeling was conducted, using data from 1,167 employees nested in 194 work teams (team level) from 38 organizations (organizational level). Results confirmed the hypotheses having team-level resources and organizational-level healthy practices significant relationships with team resilience. This study provides evidence that team and organizational resources have a strong relationship with team resilience. Practitioners and managers must take these results into account for planning how to manage their resources within the organization. This article found what resources are required (at the team and the organizational level) to help work-team resilience.     

Converting experiences in ‘communities of practice’: ‘educational’ migration in Denmark and achievements of Ukrainian agricultural apprentices

This article looks at ‘educational’ migration instigated by the Danish programme of agricultural apprenticeships, which since the late 1990s has brought many young Ukrainians to rural Denmark. It discusses discrepancies between the logic of achievement implied by the programme’s ideology on the one hand, and Ukrainian apprentices’ aspirations to social mobility on the other hand. In this way, the article questions the concept of ‘community of practice’ that has been used to describe the formation of a social persona sharing the values of this community. Using ethnographic case studies of former apprentices, I argue that while apprenticeships often fail to produce a shared social and professional identity within a community of practice, there are many ways in which the experiences afforded by Danish apprenticeships lead to (sometimes unforeseen) achievements.     

Transformational leadership and ambidexterity in the context of an acquisition

This study explores the role of transformational leadership and the values incorporated in a learning culture in promoting ambidexterity (the ability to explore new capabilities while exploiting existing ones) in teams involved in acquisition integrations. Data from a field study of an acquisition integration (N = 71 work teams) support hypotheses arguing that transformational leadership behaviors and the development of a learning culture, characterized by psychological safety, openness to diverse opinions, and participation in decision making, promote ambidexterity at the team level. We also found support for the association between transformational leadership and learning cultures.     

The Skew-Normal Distribution on the Simplex

Density functions on the simplex defined with respect to the Lebesgue measure can change from unimodality to multimodality with perturbation. This phenomenon is induced by the incompatibility of the Aitchison geometry and the Lebesgue measure. A Lebesgue-type measure, compatible with the algebraic geometric structure of the simplex, is used here to define the skew-normal density on the simplex as the Radon-Nykodym derivative with respect to it. Similarities and differences between the densities obtained using the different measures are analyzed.