Robustness and monotonicity properties of generalized correlation coefficients

A new class of generalized correlation coefficients that contains the Pearson and Kendall statistics as special cases was defined by Chinchilli et al. (2005) and applied to the estimation of correlations coefficients within the context of 2×2 cross-over designs for clinical trials. In this paper, we determine the infinitesimal robustness and local stability properties of these generalized correlation coefficients by deriving their corresponding influence functions. For cases in which the population distribution is a bivariate normal or a mixture of bivariate normal distributions we obtain explicit formulas, and establish monotonicity and sign-reverse rule properties of the generalized correlation coefficients.     

On a problem with singularity in comparison of linear experiments

For consistency, the parameter space in the Gauss-Markov model with singular covariance matrix is usually restricted by observation vector. This restriction arises some difficulties in comparison of linear experiments. To avoid it we reduce the problem of comparison from singular to nonsingular case.     

Asymmetric social protection systems with migration

We study the consequences of the coexistence of different social protection systems on contribution rate levels and migration in a two-country model. Before any migration takes place, the levels of contribution rates are chosen by a representative elected in each country. The migration of each agent depends on her anticipation of other agents’ migrations. We show that the richest agents are attracted to the Bismarckian country. The poorest agents tend to migrate toward one country or the other depending on the Beveridgean country contribution rate. The Beveridgean country can set a higher contribution rate to limit the departures of rich agents.

Pregnant women’s choice of birthing hospital: A qualitative study on individuals’ preferences

Objective

To investigate pregnant women’s decision making in relation to their choice of birthing hospital and, in particular, their priorities regarding hospital characteristics.

Arcs in $$\mathbb Z^2_{2p}$$

An arc in \(\mathbb Z^2_n\) is defined to be a set of points no three of which are collinear. We describe some properties of arcs and determine the maximum size of arcs for some small n.     

Women's experiences of self-reporting health online prior to their first midwifery visit: A qualitative study

Background

Information and communication technologies are increasingly used in health care to meet demands of efficiency, safety and patient-centered care. At a large Danish regional hospital, women report their physical, mental health and personal needs prior to their first antenatal visit. Little is known about the process of self-reporting health, and how this information is managed during the client-professional meeting.

Organizational persistence in the use of war gaming and scenario planning

Even though war gaming and scenario planning are widely used in business contexts, there is little evidence that either practice is associated with superior performance. Why, then, spend the costs? In this paper we address this puzzle and suggest why the extant empirical findings have so far proven limited. We consider the development of these practices and find that they have a substantially entangled and overlapping history, particularly at the RAND Corporation in the 1950s. Despite shared historical roots, the treatment of war gaming and scenario planning in the scholarly literature branched out into different streams. This separation is unfortunate because it obscures a better understanding of the premises under which these practices are effective. We propose an analysis of the overlaps and contrasts of war gaming and scenario planning that sets out clear boundary conditions for their use and efficacy. We find that each practice is tailored to provide strategic guidance in a context where the organization is facing different forms of uncertainty. This suggests they may be effective, and thus improve organizational performance, where the relevant uncertainties are operative. Such benefits would be apparent over longer time scales, and only if the relevant boundary conditions are met. However, to the best of our knowledge, no longitudinal empirical test of either war gaming or scenario planning is available. We therefore conclude that more research is needed to ascertain the true relationship between these popular practices and their performance outcomes.     

The Sidewalk as a Contested Space: Women’s Negotiation of Socio-Spatial Processes of Exclusion in Public Urban Space in Saudi Arabia; The Case of Al Tahlia Street

Riyadh is one of the most gender-segregated cities in the world. However, as gender segregation is less enforced on sidewalks, it provides an optimal case study for a space where women and men may be co-present. Thus, this paper aims to increase the understanding of the relationship between sociocultural norms and spatial programming regarding spatio-temporal inclusion or exclusion in public urban spaces. The results show that women’s use and access to sidewalks are influenced by gender norms, religious values, gendered regulations, and generic spatial programming. For instance, regulations limit the use of outdoor seating to men only, thus sidewalks adjacent to, e.g., cafes function as mono-gender spaces dominated by men. However, young women negotiate spatially bounded gender norms through their presence, behaviour, and dress. Although sidewalks are conceived as men’s space, women account for nearly half of the users, but their use often goes unnoticed as women self-regulate their spatio-temporal and visible presence. The study presents six types of women’s spatio-temporal behaviours with varying degrees of visible and invisible users. Ultimately, this paper argues that planning for inclusive sidewalks cannot be addressed solely through the ‘universal’ characterization of space; it should also be supplemented by context-specific knowledge regarding the socio-spatial needs.