Log‐mean Linear Parameterization for Discrete Graphical Models of Marginal Independence and the Analysis of Dichotomizations

We extend the log‐mean linear parameterization for binary data to discrete variables with arbitrary number of levels and show that also in this case it can be used to parameterize bi‐directed graph models. Furthermore, we show that the log‐mean linear parameterization allows one to simultaneously represent marginal independencies among variables and marginal independencies that only appear when certain levels are collapsed into a single one. We illustrate the application of this property by means of an example based on genetic association studies involving single‐nucleotide polymorphisms. More generally, this feature provides a natural way to reduce the parameter count, while preserving the independence structure, by means of substantive constraints that give additional insight into the association structure of the variables. © 2014 Board of the Foundation of the Scandinavian Journal of Statistics     

Ausbildungssupervision im Fokus der Expertiseforschung

While supervision is well established in the formation of consultants and psychotherapists, it is seldom offered in trainer formation. Recent research on the behavior and cognition of experts in complex dynamic domains suggests that trainers widely use implicit knowledge structures for their professional activities. These structures, however, are not necessarily accessible to conscious reflection. Supervision respectively coaching supports changes of such implicit knowledge structures and also supports the development of professional expertise. It is recommended to implement such support and counseling as an obligatory requirement in the formation of trainers.     

HYBRIDITY AND DOUBLE CONSCIOUSNESS

There is a steady consensus within academic cultural studies concerning the fact that reifications (or ‘essentializations’) of ethnicity, whether literally meant or practically used, like reifications involving gender or national identity, are not good from a political perspective. The common response invokes hybridity as a counter-concept strong enough to dissolve the dangers of either hegemonic or counter-hegemonic reification and by the same token is able to ground a sufficiently fluid politics of identity/difference that might warrant the cultural redemption of the subaltern. Nevertheless, the political force of hybridity, such as it may be, remains to a large extent contained within a politics of the colour line. Without abandoning it, that is, without altogether abandoning the terrain of a politics of the subject, it would seem necessary to move beyond the theorization of hybridity in cultural studies in order to find ways to articulate subaltern resistance against the terror of dominant identities more effectively within a larger commitment to economic justice.

Hybridity categories, once they solidify into a strategic political project, circumscribe political life to subjective agency; but subjective agency does not exhaust the political. Ultimately, the postulation of subjective agency as the limit of the political remains trapped within a Cartesian game of calculation and counter-calculation which is by its very nature unable to break through and beyond the internalization of hegemony. Some appeal to a position of exteriority remains necessary in order to restitute the possibility of what,following Balibar, we might call ‘unconditional insurrection’. Unconditional insurrection does not name a voluntaristic project of world revolution. It names, rather, the possibility of an other history, of an alternative historical memory: a memory made possible by the simple fact that things could be, and could have been, other than what they are.     

Weibull and generalised exponential overdispersion models with an application to ozone air pollution

We consider the problem of estimating the mean and variance of the time between occurrences of an event of interest (inter-occurrences times) where some forms of dependence between two consecutive time intervals are allowed. Two basic density functions are taken into account. They are the Weibull and the generalised exponential density functions. In order to capture the dependence between two consecutive inter-occurrences times, we assume that either the shape and/or the scale parameters of the two density functions are given by auto-regressive models. The expressions for the mean and variance of the inter-occurrences times are presented. The models are applied to the ozone data from two regions of Mexico City. The estimation of the parameters is performed using a Bayesian point of view via Markov chain Monte Carlo (MCMC) methods.     

Recoverable robust timetabling for single delay: Complexity and polynomial algorithms for special cases

In this paper, we study the problem of planning a timetable for passenger trains considering that possible delays might occur due to unpredictable circumstances. If a delay occurs, a timetable could not be able to manage it unless some extra time has been scheduled in advance. Delays might be managed in several ways and the usual objective function considered for such purpose is the minimization of the overall waiting time caused to passengers. We analyze the timetable planning problem in terms of the recoverable robustness model, where a timetable is said to be recoverable robust if it is able to absorb small delays by possibly applying given limited recovery capabilities. The quality of a robust timetable is measured by the price of robustness that is the ratio between the cost of the recoverable robust timetable and that of a non-robust optimal one.     

Adapting The Revised Self-Leadership Questionnaire to The Portuguese Context

This study aimed to adapt the Revised Self-Leadership Questionnaire (RSLQ) (Houghton and Neck in J Manag Psychol 17(8):672?C691, 2002) for the Portuguese population. 720 professionals, and university and post-graduate students participated in this study. The RSLQ factorial structure was accessed through exploratory and multi group confirmatory factor analysis. From the 9 sub dimensional and 34 items original scale, only 7 sub dimensions and 21 items were preserved. The model tested through cross-validation multigroup analysis proved to be totally invariant across the groups, suggesting good model fit.     

Karrierecoaching im Spannungsfeld zwischen beruflichem Ehrgeiz und Privatleben

Career coaching between professional ambition and private lifeThe ever continuing pressure to perform is a major conflict for more and more executives in balancing their professional and their private lives; sometimes even the performance itself suffers from this conflict. The author shows by a case study how executives can cope quickly with this stress and how they can find satisfying solutions with the help of a career coach.     

EXPOSURE TO MARITAL AND FAMILY THERAPY IN MEDICAL SCHOOL: A STUDENT PERSPECTIVE

Most marital and family therapists, both medically and nonmedically trained, regularly interact with physicians on a professional basis. Though some physicians receive specific training in marital and family therapy in their postgraduate residency programs, (notably those in psychiatry and family medicine), for many, the only academic exposure they receive to this field comes during a 6- to 10-week clinical clerkship in psychiatry during their third or fourth year of medical school. No study could be located which examined marital and family therapy training in undergraduate medical education. The purpose of this study was to gain a better understanding of the level of marital and family therapy training in medical school and to provide information concerning physicians who are not family therapists, and how much knowledge about the field they can be expected to have.     

Health care service and ethnic minorities: The case of Austria

The present article delineates the way in which a number of factors—societal as well as individual—define the health profile of ethnic minorities as well as hinder their access to and appropriation of an adequate health care service. It is based on an exploratory study—the first of its kind to be carried out in Austria—undertaken by ‘The Interdisciplinary Centre for Comparative Research in the Social Sciences’ on the subject of ‘Foreigners and Health’.