Design of computer experiments: space filling and beyond

When setting up a computer experiment, it has become a standard practice to select the inputs spread out uniformly across the available space. These so-called space-filling designs are now ubiquitous in corresponding publications and conferences. The statistical folklore is that such designs have superior properties when it comes to prediction and estimation of emulator functions. In this paper we want to review the circumstances under which this superiority holds, provide some new arguments and clarify the motives to go beyond space-filling. An overview over the state of the art of space-filling is introducing and complementing these results.     

Relationship between Online Retailers’ Reputation and Product Returns

Customer product returns are key cost drivers that eat into online retailers’ profits. However, management research has neglected to examine ways of reducing return rates without causing a concomitant decrease in sales. Drawing from signalling and dissonance theories, we investigate the relationship between online retailers’ reputation and product return rates. Two experiments designed to produce causal conclusions show that reputation reduces return rates (Studies 1 and 2) and that return motivation is a boundary condition for that relationship (Study 2). A field study based on an online consumer panel demonstrates the robustness of the negative impact of online retailer reputation on product returns in a setting that emphasizes external validity (Study 3), in comparison with Studies 1 and 2, which maximize internal validity. Study 3 also examines managerially important contingencies of the causal relationship by considering three variables: purchase frequency; retailer type; and customer gender. Overall findings indicate that an online retailer's reputation is a powerful means of reducing product return rates. The findings also show that the strength of the relationship between reputation and product returns is influenced by return motivation and the three variables investigated in the field study.     

Maternal Social Coaching Quality Interrupts the Development of Relational Aggression During Early Childhood

Previous research has shown that parents of socially competent young children provide them with elaborative, explicit, appropriate, and emotion‐laden advice about peer interactions. The current study analyzed mothers' conversations with preschoolers (N = 175; 52 percent female; M age = 52 months, SD = 7 months) about peer conflicts involving relational aggression. Conversations were coded for maternal elaboration, emotion references, and discussion of norm violations. Information about relational and physical aggression was collected from teachers at two assessments approximately 12 months apart for a subsample of 136 children. Regression analyses, controlling for physical aggression, showed that average and high levels of effective coaching operated as a protective factor against stable high levels of relational aggression. Theoretical and practical implications for our understanding of the early development of relational aggression are discussed.     

Post-war labour migration in Western Europe: an overview

The author outlines trends in labor migration in Europe since World War II and discusses changes in migration policy. Attention is given to policies toward foreigners during economic recessions and to the components of change in the foreign population. Freedom of movement among the member states of the European Community is discussed, and likely future developments are considered. (SUMMARY IN FRE AND SPA)     

The Generosity Game and calibration of inequity aversion

In the Generosity Game the agreement payoff of the proposer is fixed whereas that of the responder can be varied by the proposer who chooses the pie size. Increasing the pie size increases the (generosity of the) offer by the same amount. We define a unit-square class of Generosity Games by weakening the payoff consequences resulting from a veto by the responder and discuss how the dictator variants can be used to test inequity aversion parameters. Experimental findings, however, so far question inequity aversion as a dominant motive and thus discourage such attempts of assessing its parameters.     

Social Work Education: Issues and Problems in Light of Recent Developments

This paper examines several aspects of the crisis in social work education, which has been aggravated by changes in American society and developments in higher education. Under “Crisis in Higher Education,” four developments are reviewed: the straining toward equality between student and teacher, the integration of subjective experience with formal content, the increased importance of continuing education, and the renewed attention needed for the place of values in teaching. The expanded definition of practice and the creation of new categories of professional personnel have triggered and exacerbated problems of quality, content, and goal. The paper concludes with suggestions for remedying the crisis.