Another characterization of the Owen value without the additivity axiom

We provide another characterization of the Owen value for TU games with a coalition structure without the additivity axiom.     

Optimal unconditional critical regions for 2 2 2 multinomial trials

Analysing a 2 2 2 table is one of the most frequent problems in applied research (particularly in epidemiology). When the table arises from a 2 2 2 multinomial trial (or the case of double dichotomy), the appropriate test for independence is an unconditional one, like those of Barnard (1947), which, although they date from a long time ago, have not been developed (because of computational problems) until the last ten years. Among the different possible versions, the optimal (Martín Andrés & Tapia Garcia, 1999) is Barnard's original one, but the calculation time (even today) is excessive. This paper offers critical region tables for that version, which behave well compared to those of Shuster (1992). The tables are of particular use for researchers wishing to obtain significant results for very small sample sizes (N h 50).     

Social Interaction Effects on Fertility: Intentions and Behaviors

The existing literature shows that the social interactions in personal networks affect individuals’ reproductive attitudes and behavior through three mechanisms: social influence, social learning, and social support. In this article, we discuss the extent to which the socio-psychological model of the Theory of Planned Behavior (TPB) takes these social mechanisms into account when used in modeling fertility intentions and behavior. We argue that by integrating all three social network mechanisms, the ability of the TPB to explain reproductive events could be enhanced in two respects. First, social influence explains why some beliefs and practices are reproduced at the individual level even in the face of macro-level changes, and social learning mechanisms are crucial to distinguish who finally adopts new behavioral beliefs and practices in response to changes at the macro level. Second, social support relationships represent a capital of services to complement institutional provision (informal child care) as well as a capital of knowledge which helps individuals navigate in a complex institutional environment, providing a crucial element to explain heterogeneity in the successful realization of fertility intentions across individuals. The integration of the three social network mechanisms into the TPB helps to address the connection between changes in what the theory indicates as background factors and variation in individual intentions and behavior. We develop specific hypotheses concerning the effect of social interactions on fertility intentions and their realization and conclude with a critical review of the existing surveys that could serve to test these hypotheses and their limits.     

Space-time Multi Type Log Gaussian Cox Processes with a View to Modelling Weeds

Log Gaussian Cox processes as introduced in Moller et al. (1998) are extended to space-time models called log Gaussian Cox birth processes. These processes allow modelling of spatial and temporal heterogeneity in time series of increasing point processes consisting of different types of points. The models are shown to be easy to analyse yet flexible enough for a detailed statistical analysis of a particular agricultural experiment concerning the development of two weed species on an organic barley field. Particularly, the aspects of estimation, model validation and intensity surface prediction are discussed.     

Nonlinear voxel-based modelling of the haemodynamic response in fMRI

A common assumption for data analysis in functional magnetic resonance imaging is that the response signal can be modelled as the convolution of a haemodynamic response (HDR) kernel with a stimulus reference function. Early approaches modelled spatially constant HDR kernels, but more recently spatially varying models have been proposed. However, convolution limits the flexibility of these models and their ability to capture spatial variation. Here, a range of (nonlinear) parametric curves are fitted by least squares minimisation directly to individual voxel HDRs (i.e., without using convolution). A ‘constrained gamma curve’ is proposed as an efficient form for fitting the HDR at each individual voxel. This curve allows for spatial variation in the delay of the HDR, but places a global constraint on the temporal spread. The approach of directly fitting individual parameters of HDR shape is demonstrated to lead to an improved fit of response estimates.     

An experimental study of thermal energy storage with phase change materials by design of experiments

Accurate theoretical modelling and simulation of thermal energy storage (TES) by means of phase change materials (PCM) is very complex and its results are not close enough to experimental values. This paper presents the empirical study of a thermal storage unit operating with a commercial PCM called RT25. The study is carried out by means of the statistical procedure, Design of Experiments. This methodology has rarely been used in the analysis of heat transfer problems. The present study has allowed us to investigate the phenomena involved and to design an actual system. We show the whole procedure followed in order to design the set-up, to run the experiments with a 2³ factorial design, to compare its results with a numerical simulation and to get the empirical model by regression. Its results have been used to design actual installations aimed at free-cooling or maintaining the temperature constant in rooms where thermal security is necessary.     

Civil Organizations in Mexico: Recent Evolution and Prospects

This paper begins by identifying how, as a result of the confluence of a number of factors, civil organizations (COs) in Mexico have shown an exponential development in the past 15 years. However, it is argued that COs are suffering a fiscal crisis and, in some sense, an economic one, provoked by the political reaction of the government toward this growth. At the same time, there is no crisis of legitimacy; their increasing levels of social support suggests a trend in the reverse direction. However, the legitimacy attributable by the population to nonprofits seems to be due to the novelty of this sociopolitical actor in the context of a disappointment with more traditional ones including government and political parties—as opposed to an endorsement of their proven capacity or efficiency in solving the problems of development. To take advantage of what seems to be a golden opportunity for its positive development, in addition to changing the unfavorable economic environment, it is argued that the sector has to face the challenge of thinking in its long-term interest and making sure that it is positioned to act as capably efficient.     

An Index of Child Health in the Least Developed Countries (LDCs) of Africa

In this article we present a new composite index of child health, applied to the Least Developed Countries (LDCs) of Africa, one of the areas of the planet most castigated by poverty. Our index has been constructed attending to the variables defined in the Goals of the Millennium Declaration. For this purpose we will use the P₂ distance method for the year 2008, the last year for which data are available. This index integrates variables of child health that permit a territorial ordering of the LDCs of Africa, in terms of those partial indicators.     

Editor's Choice: An Interview with Hans Joas

The interview explores multiple aspects of social theory, most of them directly related to Joas's theory and others to symbolic interactionism and Goffman. The first part delves into Joas's theory in three respects. First, a clarifying note on a common misunderstanding about his book The Creativity of Action. Second, a clarification on the scope of his theoretical endeavor, and third, a look into his coming books to have a better grasp of the course that his theory is taking. The second part is dedicated to symbolic interactionism and Goffman. Firstly, Joas's opinion about the theoretical relationship between symbolic interactionism and macrosociology is emphasized, secondly, his opinion about the pertinence of locating Goffman within symbolic interactionism is stated, and thirdly, a brief commentary about the relationship between Joas's theory and Goffman's is introduced.     

Internal migration and the politics of place: a comparative analysis of China and Indonesia

Spontaneous and organized population movements have long been used as a means of promoting a country's goals of development and national integration. At the local level, on the other hand, these movements have frequently done the opposite, fueling local grievances, sharpening group distinctions, and at times creating ‘sons-of-the-soil’ conflicts. In this paper, I explore this apparent tension between the national political rationale for internal migration and the political impact such migration has had locally, in four minority regions of China and Indonesia. I argue that the specific manner in which migration affects local politics is influenced by a country's political regime. In Indonesia, the impact of migration is observed in electoral politics, where ‘politics of place’ have been allowed to emerge. In China, it is perceived in the curbing of national minorities’ territorial autonomy. The role played by local elites and group competition between indigenous people and migrants are also reviewed.