Une condition nécessaire d'admissibilité et ses conséquences sur les estimateurs à rétrécisseur de la moyenne d'un vecteur normal

Considering exponential families of distributions, we estimate parameters which are not the natural parameters. We prove that the admissible estimators of these parameters are limits of Bayes estimators and can be expressed through a given functional form. An important particular case of this model pertains to the estimation of the mean of a multidimensional normal distribution when the variance is known up to a multiplicative factor. We deduce from the main result a necessry condition for the admissibility of matricial shrinkage estimators.     

SEPARATION, WEAK EXOGENEITY, AND P-T DECOMPOSITION IN COINTEGRATED VAR SYSTEMS WITH COMMON FEATURES

The aim of this paper is to study the concept of separability in multiple nonstationary time series displaying both common stochastic trends and common stochastic cycles. When modeling the dynamics of multiple time series for a panel of several entities such as countries, sectors, firms, imposing some form of separability and commonalities is often required to restrict the dimension of the parameter space. For this purpose we introduce the concept of common feature separation and investigate the relationships between separation in cointegration and separation in serial correlation common features. Loosely speaking we investigate whether a set of time series can be partitioned into subsets such that there are serial correlation common features within the sub-groups only. The paper investigates three issues. First, it provides conditions for separating joint cointegrating vectors into marginal cointegrating vectors as well as separating joint short-term dynamics into marginal short-term dynamics. Second, conditions for making permanent-transitory decompositions based on marginal systems are given. Third, issues of weak exogeneity are considered. Likelihood ratio type tests for the different hypotheses under study are proposed. An empirical analysis of the link between economic fluctuations in the United States and Canada shows the practical relevance of the approach proposed in this paper.     

Extent and sources of occupational stress in university staff

Canadian higher education sector has undergone numerous changes during the past decades. Increased student enrolments, massive cuts in human resources and constant restructuring are changes likely to have had a considerable impact on all employees (e.g., administrative, trades, and faculty). While many studies conducted in different countries have shown that stress in universities is a problem of alarming proportions, to date, no study of the entire staff of a university has been carried out in Canada. This research uses an approach based on the prevention and management of the sources of occupational stress to study 1086 employees of a Quebec university. Data were collected by means of questionnaires and semi-structured interviews. It was found that the proportion of individuals who reported a high level of psychological distress was twice as high (40%) than that reported for a Quebec-wide sample (20%). Work overload, the relationship with one's superior and participation in decision making were systematically reported as high risks to employees' health. It was found that human resources management practices have not followed the rapid organizational changes which affected the university in the past years. The results are discussed in light of the risk management approach.     

Goodness-of-Fit Methods for Probabilistic Index Models

A class of semiparametric regression models, called probabilistic index models, has been recently proposed. Because these models are semiparametric, inference is only valid when the proposed model is consistent with the underlying data-generating model. However, no formal goodness-of-fit methods for these probabilistic index models exist yet. We propose a test and a graphical tool for assessing the model adequacy. Simulation results indicate that both methods succeed in detecting lack-of-fit. The methods are also illustrated on a case study.     

Paternal supervisor gatekeeping: How supervising fathers hinder other fathers at work in their uptake of flexible work arrangements

This study explores the role that supervisors play in the low uptake of Flexible Work Arrangements (FWA) among fathers in France. We draw on 28 interviews with fathers who had requested access to FWA and reported on the reaction of their supervisors. These supervisors were all fathers themselves and had previously benefitted from such arrangements themselves, but did not grant such policies to other fathers. To understand these unexpected findings, we conducted an additional 16 interviews with supervising fathers in organizations who had previously enjoyed similar FWA. The findings show that supervising fathers can act as barriers to other fathers in their organizations who try to push for more gender equality. We identified four ways in which supervisors tend to dissuade fathers from accessing policies to which they are entitled: gender-role confirming discourses; career threats; practical reasons as a justification; and a lack of paternal workplace support. The findings highlight the role of men (in this case, supervising fathers) in the lack of increasing gender equality at work. By showing that fathers can function as ‘paternal supervisor gatekeepers’ for other fathers in their organizations, we open up new fruitful ways for studying gender equality in organizations.     

Active social policies revisited by social workers

Social policies are described as active on the basis of formal legal provisions, or on the grounds of expenditure data. Using the notion, set forth by Lipsky, M. [(1980). Street-level bureaucracy: Dilemnas of the individual in public services (2010 ed.). New York, NY: Russell Sage Foundation] as well as by several subsequent authors, that social workers who implement policies actually play a role in (re)defining them, the present article intends to explore the way in which active social policies are implemented in a Swiss canton. On the basis of an original study, we show that, on the one hand, social workers tend to view activation as a distant perspective – which means they often do no put it into practice right away. And activation, when social workers do deem it to be necessary, takes on different meanings depending on whether they are dealing with young people or with mothers. As a result, the actual meaning of the word activation varies – a fact that scholars who focused solely on formal/legal activation policies were not in a position to observe.