Optimality of the quasi-score estimator in a mean–variance model with applications to measurement error models

We consider a regression of y$y$ on x$x$ given by a pair of mean and variance functions with a parameter vector θ$\theta$ to be estimated that also appears in the distribution of the regressor variable x$x$. The estimation of θ$\theta$ is based on an extended quasi-score (QS) function. We show that the QS estimator is optimal within a wide class of estimators based on linear-in-y$y$ unbiased estimating functions. Of special interest is the case where the distribution of x$x$ depends only on a subvector α$\alpha$ of θ$\theta$, which may be considered a nuisance parameter. In general, α$\alpha$ must be estimated simultaneously together with the rest of θ$\theta$, but there are cases where α$\alpha$ can be pre-estimated. A major application of this model is the classical measurement error model, where the corrected score (CS) estimator is an alternative to the QS estimator. We derive conditions under which the QS estimator is strictly more efficient than the CS estimator.     

Immigration as a commitment device

This paper shows that the admittance of immigrants who are on average less skilled than natives can be part of a support-maximizing government policy despite a general political bias in favour of the poor. We make this point in a simple model with redistributive unemployment insurance. Once wage contracts are binding, the government has an incentive to increase the unemployment benefit, which leads to excessive unemployment. Affecting the political balance within the constituency, immigrants can serve as a commitment device against this time inconsistency. We show that this possibility can be greatly promoted by restrictions on political naturalization.

Market Fashioning

Theory and Society - How do markets come about? This article offers a first systematic analysis of three different ideal types of market fashioning: mutual adjustment, organization, and fields....     

Intergenerational Housing: The Case of Humanitas Netherlands

We analyze a case study of an innovative intergenerational housing arrangement in the Netherlands as an example of how a local long-term elderly care practice evolved in response to contemporary challenges. Identified elements of the established local practice relate to the characteristics and strategies of an institutional entrepreneur and elements of the new practice that comes into being, in which reciprocity and mutual learning have a central place. These elements might benefit future elderly housing initiatives as well.     

Can a ‘veil of ignorance’ reduce the impact of distortionary taxation on public good valuations?

Journal of Risk and Uncertainty - Monetary valuations for mortality and health risk reductions, elicited through stated preference surveys, have been shown to include values placed on others’...     

Sexual and Relationship Satisfaction associated with Shifts in Dyadic Trajectories of Depressive Symptoms in German Couples across Four Years

Depression is a pervasive mental health concern; thus, it is important to identify modifiable factors associated with reducing depressive symptoms across time. Using 1,876 heterosexual couples assessed annually across 4 years from the Panel Analysis of Intimate Relationships and Family Dynamics (Pairfam) study, time‐varying covariate growth models tested if sexual and relationship satisfaction were linked with shifts in trajectories of depressive symptoms across time. For both men and women, higher sexual and relationship satisfaction scores were significantly associated with decreasing their own depressive symptom trajectories, but only relationship satisfaction was linked with their partners’ depressive symptom trajectories. Potential clinical implications include the treatment of depressive symptoms by making changes across time in their own relationship satisfaction and sexual satisfaction.     

On the effect of free vs. restricted interaction during the exploration of virtual environments

Exploration of a Virtual Environment (VE) might vary as well in applied technology as in the conceptual design. A conceptual difference of exploring style and navigation type relates to the degree of freedom a user possesses. It ranges from completely unrestricted to completely restricted navigation. To assess the impact of different exploration styles, an experiment was carried out. Four different styles were compared in a large-scale VE. The navigation of the participants was either free or restricted in various levels concerning motion and viewing direction. During the exploration, the participants memorized the location of flags, which represented special events at these locations. The participant's task was to memorize position and color of the flags. Subsequently, they marked the positions and colors of the flags in a map of the scene. The performance in this task was captured, as well as data about their amount of experienced simulator sickness and subjective workload. Additionally, balancing tests were administered to investigate in an objective measurement of simulator sickness. Each condition showed the same achievement in the memorizing task and the subjective workload. Furthermore, the measured high variance in simulator sickness symptoms overrode other effects. In the balancing tests a basic influence of exposure with VE was found. However, subsequent interviews with the participants showed that the personal impression of the efficiency of exploration method was highly individual. By finding and matching exploration methods to individual persons, benefit by using Virtual environments could be enhanced.