Expected utility from additive utility on semigroups

In the present paper we study the framework of additive utility theory, obtaining new results derived from a concurrence of algebraic and topological techniques. Such techniques lean on the concept of a connected topological totally ordered semigroup. We achieve a general result concerning the existence of continuous and additive utility functions on completely preordered sets endowed with a binary operation ``+', not necessarily being commutative or associative. In the final part of the paper we get some applications to expected utility theory, and a representation theorem for a class of complete preorders on a quite general family of real mixture spaces.     

Determinants of Household Insurance Coverage Among Low‐Income Families from Boston,Chicago, and San Antonio: Evidence from the Three‐City Study*

Objectives. In this article we examine correlates of health insurance coverage for low‐income households. Methods. Using data from the Welfare, Children, and Families Project (1999–2001), a sample of 2,402 low‐income families from Boston, Chicago, and San Antonio, we estimate two logistic regressions, one that predicts health insurance coverage for one focal child in each household and another that assesses the odds that all children in the household have coverage. Results. The children of poorly‐educated, immigrant, and Mexican‐origin parents are at an elevated risk of lacking insurance. These characteristics also increase the risk of incomplete household coverage. Mexican‐origin children and households are at particularly high risk of lacking complete coverage, a fact partially reflecting their residential concentration in states with high uninsurance rates, such as Texas. Conclusions. Serious holes in the health‐care safety net affect poor Americans differently based on their state of residence, race, ethnicity, and household structure.     

The ‘Parkour Organisation’: inhabitation of corporate spaces

This paper discusses the corporate city and the way it structures the experience of its inhabitants. The corporate city is seen here as the embodiment of power relationships of a distinctly postmodern nature, a means to preserve and promote hegemonic and homogenising discourses like globalisation and consumerism. Corporate design and architecture embody specific kinds of relationships, experiences and perceptions of space and place. We will suggest that the corporate city is homogenised, lacking richness of civic space, not just in terms of form but in terms of structures (both, spatial structures and the kind of social structures/interactions they invite). The activities of a group of traceurs practising parkour are described and their philosophy is explained as a metaphor for active participation and dialectic relationship between the actual and the possible structures of the world. Richness of experience, strengthening of community, variety of activity, openness and possibility are irrelevant (actually, inimical) to the corporate forces that shape our cities today. However, as the experience of parkour demonstrates, extreme artforms of ‘urban activism’ but also, more importantly, human agency and the performativity of the everyday, are capable of transforming the otherwise alienating non‐places, to grounds of possibility, creativity and civic identity.     

It's His Right,It's Her Duty: Benevolent Sexism and the Justification of Traditional Sexual Roles

This study tested the effects on social perceptions of sexual marital rights and duties of ambivalent sexist ideology and information about the benevolent sexist ideology of a husband, portrayed in a hypothetical marital vignette. In addition, the perception of whether hypothetical forced sex between husband and wife is considered rape was explored. For one half of the participants (college students), the husband was presented as high in benevolent sexism (BS); and for the other half, no information about his ideology was given. Results showed that participants in the first group ranked sexual marital rights (for him) and duties (for her) more highly, and regarded forced sex as rape to a lesser extent. Positive relationships were also found between participants’ BS and these ratings. Moreover, participants’ perceptions of marital rights and duties played a mediating role in the relationship between their BS and their perception of forced penetration as rape. Finally, an interaction was found between participants’ and husbands’ BS in the perception of marital rights and duties: The influence of participants’ BS was higher when the husband was presented as a benevolent sexist man. Results highlight the role of sexist attitudes in the interpretation of marital rape.     

Is the German system of corporate governance converging towards the Anglo-American model?

This paper analyses whether the German corporate governance is converging towards Anglo-American practices. We summarise the extant empirical evidence on the various governance mechanisms that economic theory suggests ensure efficiency and describe recent legal developments. We find no clear signs of convergence in form, i.e. the main distinctive features of the German system have remained largely unaltered. However, changes occurred over the last decade (specially in the legal framework) suggest a certain convergence in function, i.e. some governance mechanisms have effectively incorporated aims and/or goals generally associated with the Anglo-American model.

Sensitivity Analysis in Gaussian Bayesian Networks Using a Divergence Measure

This article develops a method for computing the sensitivity analysis in a Gaussian Bayesian network. The measure presented is based on the Kullback–Leibler divergence and is useful to evaluate the impact of prior changes over the posterior marginal density of the target variable in the network. We find that some changes do not disturb the posterior marginal density of interest. Finally, we describe a method to compare different sensitivity measures obtained depending on where the inaccuracy was. An example is used to illustrate the concepts and methods presented.     

Nonparametric Estimation of the Average Availability

The average availability of a repairable system is the expected proportion of time that the system is operating in the interval [0, t]. The present article discusses the nonparametric estimation of the average availability when (i) the data on ‘n’ complete cycles of system operation are available, (ii) the data are subject to right censorship, and (iii) the process is observed upto a specified time ‘T’. In each case, a nonparametric confidence interval for the average availability is also constructed. Simulations are conducted to assess the performance of the estimators.     

Analysis of Type I Error Rates of Univariate and Multivariate Procedures in Repeated Measures Designs

We compared the robustness of univariate and multivariate statistical procedures to control Type I error rates when the normality and homocedasticity assumptions were not fulfilled. The procedures we evaluated are the mixed model adjusted by means of the SAS Proc Mixed module, and Bootstrap-F approach, Brown–Forsythe multivariate approach, Welch–James multivariate approach, and Welch–James multivariate approach with robust estimators. The results suggest that the Kenward Roger, Brown–Forsythe, Welch–James, and Improved Generalized Aprroximate procedures satisfactorily kept Type I error rates within the nominal levels for both the main and interaction effects under most of the conditions assessed.     

Gaussian Markov random field spatial models in GAMLSS

This paper describes the modelling and fitting of Gaussian Markov random field spatial components within a Generalized AdditiveModel for Location, Scale and Shape (GAMLSS) model. This allows modelling of any or all the parameters of the distribution for the response variable using explanatory variables and spatial effects. The response variable distribution is allowed to be a non-exponential family distribution. A new package developed in R to achieve this is presented. We use Gaussian Markov random fields to model the spatial effect in Munich rent data and explore some features and characteristics of the data. The potential of using spatial analysis within GAMLSS is discussed. We argue that the flexibility of parametric distributions, ability to model all the parameters of the distribution and diagnostic tools of GAMLSS provide an ideal environment for modelling spatial features of data.