Bayesian Multivariate Spatial Interpolation with Data Missing by Design

In a network of s _g sites, responses like levels of airborne pollutant concentrations may be monitored over time. The sites need not all measure the same set of response items and unmeasured items are considered as data missing by design . We propose a hierarchical Bayesian approach to interpolate the levels of, say, k responses at s _u other locations called ungauged sites and also the unmeasured levels of the k responses at the gauged sites. Our method involves two steps. First, when all hyperparameters are assumed to be known, a predictive distribution is derived. In turn, an interpolator, its variance and a simultaneous interpolation region are obtained. In step two, we propose the use of an empirical Bayesian approach to estimate the hyperparameters through an EM algorithm. We base our theory on a linear Gaussian model and the relationship between a multivariate normal and matrix T -distribution. Our theory allows us to pool data from several existing networks that measure different subsets of response items for interpolation.     

Much Ado About Nothing?

We can only welcome the discourse that has been initiated in our professional community with the concept of public sociology in the focus. Undoubtedly, Michael Burawoy has indisputable merits in fuelling this international dialogue. I find, however, that his position and conceptual framework is debatable at several points, therefore my review is on the side of those who criticize his ideas. My paper is divided into three parts: in keeping with the idea that the drop mirrors the ocean, I will start with the detailed critique of a single paragraph—the one which makes comments on his table entitled Types of sociological knowledge. It will be argued that by switching his viewpoints and using vaguely defined notions without empirical evidences he often tackles his subject inconsistently. Secondly, I intend to offer an alternative, three-dimensional conceptual model in which the social scientist’s prestige, influence and position on the action chain is taken into account as the main analytical aspects of the relationship between her/him and the public. Finally, based on this model, I propose to identify some strategies in order to find a better balance between the public and professional activity of social scientists.     

Changes in conjugal life in Canada: Is cohabitation progressively replacing marriage?

This article aims first to contrast the trends of marriage and cohabitation across different regions in Canada, and second, to assess whether cohabitation constitutes a new stage in the progression to marriage, or an alternative to marriage altogether. Based on various empirical demographic indicators, the analysis shows profound differences across the country. In Quebec, cohabiting unions are now widely accepted as forming the basis for family life, whereas they still largely constitute a childless prelude to marriage elsewhere in Canada. The authors discuss the role of different religious and cultural backgrounds, and of recent changes in the relationships between men and women, in accounting for the divergent evolution observed.