Estimation of parameters of the inverse gaussian-weibull mixture model

The main objective of this work is to estimate the 5-dime-nsional vector of parameters (p,μ,λ,α,c) of the mixture of an Inverse Gaussian IG(μ,λ) and Weibull W(α,c) distributions with mixing proportion p. We use the maximum Likelihood method (MLM) and the weighted maximum likelihood method (WMLM), both under the sampling schemes suggested by Hosmer (1973). Simulation study shows that the WMLM performs best, when Hosmer's model 2 is used, in the sense of minimizing the mean square error.     

A response to criticism of our estimates of under-5 mortality in Iraq, 1980–98

According to estimates published in this journal, the number of deaths of children under 5 in Iraq in the period 1991–98 resulting from the Gulf War of 1991 and the subsequent imposition of sanctions by the United Nations was between 400,000 and 500,000. These estimates have since been held to be implausibly high by a working group set up by an Independent Inquiry Committee appointed by the United Nations Secretary-General. We believe the working group's own estimates are seriously flawed and cannot be regarded as a credible challenge to our own. To obtain their estimates, they reject as unreliable the evidence of the 1999 Iraq Child and Maternal Mortality Survey—despite clear evidence of its internal coherence and supporting evidence from another, independent survey. They prefer to rely on the 1987 and 1997 censuses and on data obtained in a format that had elsewhere been rejected as unreliable 30 years earlier.     

Multiple step-stress accelerated life test: the tampered failure rate model

Battacharyya and Soejoeti (1989) proposed the tampered failure rate model for step-stress accelerated life testing. In this note, their model is generalized from the simple (2-step) step-stress setting to the multiple (k-step, k > 2) setting. For the parametric setting where the life distribution under constant stress is Weibull, maximum likelihood estimation is investigated and the situation where the different stress levels are equispaced is looked at.     

Evidence-Based Evaluation of Staircase Architectural Design to Reduce the Risk of Falling for Older Adults

The impact of an increasingly aging population warrants accommodations in home architectural design. Focusing on the staircase design criteria as part of the home environment, this article presents an integrated evidence-based staircase evaluation for home staircase design to reduce the risk of falling for older adults (those 65 years and older). The staircase evaluation has been developed by dividing the staircase into four design elements: handrail design, step design, staircase geometric design, and lighting. Each element is divided into several features that define its architectural design. For example, the step design element is further divided into four features: going depth, riser height, nosing, and step finishing material. A hierarchical list is provided based on an evidence-based comparison of various scenarios for each feature. The hierarchical list presents the comparative effect of each scenario on reducing the risk of falling for older adults.     

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.     

Using the Concepts of Hermeneutical Injustice and Ideology to Explain the Stability of Ancient Egypt During the Middle Kingdom

This paper argues that the relative stability of ancient Egyptian society during the Middle Kingdom (c.2055 – 1650 BC) can in part be explained by referring to the phenomenon of hermeneutical injustice, i.e., the manner in which imbalances in socio-economic power are causally correlated with imbalances in the conceptual scheme through which people attempt to interpret their social reality and assert their interests in light of their interpretations. The court literature of the Middle Kingdom is analyzed using the concepts of hermeneutical injustice and ideology. It is argued that while it is true that there was room for maneuver and for internal critique, the efficacy of internal critique was hindered by the structure of the intellectual discourse of Middle Kingdom Egypt. This intellectual discourse was suitable for the interpretation of social reality in a way that allowed the elites to assert their interests, but it was not suitable for the interpretation of social reality in a way that accorded with the interests of the exploited peasantry.     

EDLP versus Hi–Lo pricing strategies in retailing—a state of the art article

The pricing strategy is seen as one of the five most important priorities in retail management. Over the past years, price wars have emerged and price has become an even more focal point of retailers’ agendas. Especially grocery retailers operate on very low margins and have fallen into a price-promotion trap, pressured both by competition and consumers. In times of intensive competition it is getting even more important for retailers to focus on profitable and successful pricing strategies. Furthermore, retailers act under complex circumstances, especially because of broad assortments, and should therefore define a clear framework for their pricing strategy. There are several studies which have been published on pricing strategy in retailing during the last years, but no comprehensive literature review of this topic with its determinants and outcomes exists. Based on the theoretical and conceptual foundations of pricing strategy in retailing, all relevant conceptual and empirical studies are analyzed. First, the different definitions of pricing strategy in retailing are examined and systemized. Furthermore, a division into studies on determinants and outcomes of pricing strategy in retailing is included followed by a discussion of main and further results. Based on this analysis of the existing literature, avenues for further research are identified and prioritized.     

Labour Policy and Determinants of Employment and Wages in a Developing Economy with Labour Shortage

Using data from a sample of 1,099 workers, this paper investigates the determinants of employment and wages for workers in the United Arab Emirates. The paper further examines the wage distribution and the decomposition of the wage gap between the public and the private sectors. Results of the study are consistent with the dual labour market theory and indicate that the labour market in the United Arab Emirates is segmented based on sectors (public versus private) and types of workers (nationals versus non‐nationals). The study concludes with a discussion of the implication of these findings for the effectiveness of labour and economic policy.