On Existence of Maximum Likelihood Estimators in Exponential Families

We propose a simple necessary and sufficient condition for existence of maximum likelihood estimators in a large class of canonical exponential families. We give an application to log-spline families.     

Shame and Cognitive Strikes: What Would it “Really” Mean for Queer Psychoanalysis to Enter the Perverse?

Clinical psychoanalysis and queer theory have at their core a deep exploration of sexuality. Although the link between shame and sex has generated a strong theoretical reflection (Butler, 1993; Dimen, 2013; Saketopoulou, 2013, 2014; Sedgwick, 1993; Stein, 1997, 2012; Straker, 2007), shame is in this literature primarily a threatening affect in need of psychic elaboration. In contrast, I look at shame as a critical and surprising intervention provoked by the analyst. I argue that analysts perform in their work not only psychic labor but also “excessive” nonverbal states which challenge the established boundaries of the analytic relationship. I show that such moments function as “cognitive strikes,” which can be productively deployed by analysts to reap their benefits.

The aim of my argument is to show that the analysts “enter the perverse” when they momentarily stop processing difficult mental states. According to the professional ideal of “mentalization” (Fonagy & Target, 1996), psychoanalysts are put in the position to permanently do cognitive work. Yet refusing this demand offers the analyst the freedom to shift the relationship between a paid laborer and a beneficiary of therapeutic work. I theorize these noncognitive acts of “excessive shame” to expand on and criticize theories of queer performativity such as Judith Butler’s and Eve Sedgwick’s. The first contribution of this article is to draw the attention of clinicians to queer work that theorizes the emergent materiality of affects. The second contribution is to ask queer psychoanalytic theorists to take seriously the potential of surprising interventions which interrupt the demand to incessantly perform mental labor for their clients.     

The Determinants of Student Migration to Poland Based on the Opolskie Voivodeship Study

Until recently Poland has been considered a country to emigrate from. However, the situation is now beginning to change, and Poland is becoming an immigration country. This also refers to student migration. Polish universities are becoming increasingly attractive to foreign students, who are mainly of Ukrainian origin. They only began to promote their services abroad in 2005 and their foreign student population growth dynamic is one of the highest in the world. The study was conducted in the Opolskie Voivodeship, the first region in Poland where systematic action was taken to address depopulation, and the steps to counteract population decline were included in its strategic policies. One of the objectives of such policies was to stimulate immigration. For this reason, it was decided that the Opolskie Voivodeship might serve as a lab to study migration processes, including the inflow of foreign students.     

A Randomization Test-Based Method for Risk Assessment in Neurotoxicology

A current trend in risk assessment for systemic toxicity (noncancer) endpoints is to utilize the observable range of the dose-effect curve in order to estimate the likelihood of obtaining effects at lower concentrations. Methods to accomplish this endeavor are typically based on variability in either the effects of fixed doses (benchmark approaches), or on variability in the doses producing a fixed effect (probabilistic or tolerance-distribution approaches). The latter method may be particularly desirable because it can be used to determine variability in the effect of an agent in a population, which is an important goal of risk assessment. This method of analysis, however, has typically been accomplished using dose-effect data from individual subjects, which can be impractical in toxicology. A new method is therefore presented that can use traditional groups-design data to generate a set of dose-effect functions. Population tolerances for a specific effect can then be estimated from these model dose-effect functions. It is based on the randomization test, which assesses the generality of a data set by comparing it to a data set constructed from randomized combinations of single point estimates. The present article describes an iterative line-fitting program that generates such a data set and then uses it to provide risk assessments for two pesticides, triadimefon and carbaryl. The effects of these pesticides were studied on the locomotor activity of laboratory rats, a common neurobehavioral end point. Triadimefon produced dose-dependent increases in activity, while carbaryl produced dose-dependent decreases in activity. Risk figures derived from the empirical distribution of individual dose-effect functions were compared to those from the iterative line-fitting program. The results indicate that the method generates comparable risk figures, although potential limitations are also described.     

Participative Immigrants or Participative Cultures? The Importance of Cultural Heritage in Determining Involvement in Associations

This paper uses insights from the literature on social capital and from the sociology of values to explain dependency of immigrants’ involvement in associations depend on the norms of participation in their country of origin as well as the norms of their host countries. The argument is that changing the social context should lead to changing participative behaviours. I use cross-classified multilevel models on the EVS 2008 data to test if average levels of participation in the host and in the origin society determine immigrants’ propensity to become member in voluntary organizations. The findings point to a partial assimilation of immigrants. Their behaviours, while influenced by their culture of origin, are mainly shaped by their country of residence. The relation is influenced by the differences between the patterns of participation in the two cultures, the age when migrating and the dependency of the origin on remittances.     

Organizational Environments, Framing Processes, and the Diffusion of the Program to Address Global Climate Change Among Local Governments in the United States

Few researchers have examined how organizational environments and framing processes simultaneously influence the diffusion of organizational practices. This article combines insight from major perspectives on the diffusion of organizational innovations and from social movement studies, and shows that the adoption of a program to address global climate change by U.S. municipalities is shaped by social contagion and organizational linkages, as well as by the actions of change-promoting agents. The findings emphasize the potential as well as the limitation of the strategic efforts on the part of innovation promoters to frame adoption in a way that will appeal to potential adopters.

A numerical analysis of supply chain performance under split decision rights

We examine periodic review supply chain models where order quantity and shipping frequency are both decision variables and decision-making rights are split between supply chain agents. We address two general questions: (1) when does decentralized decision making result in the greatest loss in supply chain performance; and (2) what effect does the distribution of channel power have on performance loss. We characterize optimal policies where possible in each scenario and we use numerical analysis to generate insights. We find that performance losses from decentralized control are somewhat limited in our results due to risk pooling and that the magnitude of performance loss is strongly influenced by the relative holding and penalty costs, but somewhat invariant to demand uncertainty. Furthermore, we find that concentrating channel power with the supplier can lead to supply chain profits that are very close to a centralized scenario, but also results in lower customer service levels.