D-optimal design for the Rasch counts model with multiple binary predictors

In this paper we derive optimal designs for the Rasch Poisson counts model and its extended version of the (generalized) negative binomial counts model incorporating several binary predictors for the difficulty parameter. To efficiently estimate the regression coefficients of the predictors, locally D-optimal designs are developed. After an introduction to the Rasch Poisson counts model and its extension, we will specify these models as particular generalized linear models. Based on this embedding, optimal designs for both models including several binary explanatory variables will be presented. Therefore, we will derive conditions on the effect sizes for certain designs to be locally D-optimal. Finally, it is pointed out that the results derived for the Rasch Poisson models can be applied for more general Poisson regression models which should receive more attention in future psychological research.     

Shaping cooperation behavior: The role of accessibility experiences and uncertainty

The present research investigates the influence on cooperative behavior of accessibility experiences associated with the retrieval of fairness‐relevant information from memory. We argue that the decision whether to cooperate in negotiations depends not only on information about the appropriateness of the negotiation procedure, but also on the experience of how difficult or easy it is to come up with this information. Supporting this hypothesis, it is shown that in the context of a bargaining experiment, participants' experiences of ease or difficulty in retrieving unfair aspects of the respective negotiation procedure strongly influence their cooperation behavior. In addition, we hypothesize and empirically substantiate that the influence of accessibility experiences on cooperation behavior occurs particularly in situations of certainty salience. Implications for future research on cooperation and on accessibility experiences are discussed. Copyright © 2009 John Wiley & Sons, Ltd.     

Patterns of Fulfilment in the Domains of Work,Intimate Relationship,and Leisure

Work, family/partnership, and leisure form the most important domains in most peoples’ lives. The present study investigated patterns of fulfilment in these domains among 1,974 German respondents. Eight groups were formed based on the combination of having experienced career progress (yes/no), having a satisfying intimate relationship (yes/no), and perceiving high levels of flow (Csikszentmihalyi 1997) during leisure activities (yes/no). Socioeconomic resources (educational attainment and income) as well as psychosocial resources differed between the success patterns, with most resources showing domain-specific positive associations with the criteria of success in life. Individuals with high levels of flow during leisure reported the highest levels of positive affect, whereas success in the field of work and intimate relationship added little. However, lowest levels of depressive symptoms were found in respondents who fulfilled at least two criteria of success. Further longitudinal research is needed for testing causal relationships between change in life success and change in aspects of psychological well-being.     

Entrepreneurial intention as developmental outcome

What predicts adults' entrepreneurial intentions? Utilizing a cross-sectional sample of 496 German scientists, we investigated a path model for the effects of entrepreneurial personality (Big Five profile), control beliefs, and recalled early entrepreneurial competence in adolescence (early inventions, leadership, commercial activities) on two types of entrepreneurial intentions (conditional and unconditional intentions). As expected, entrepreneurial personality and early entrepreneurial competence on the one hand and both types of entrepreneurial intentions on the other were associated. Findings of structural equation modeling further revealed indirect effects via control beliefs (e.g., mediation effects). The results highlight the importance of a life span developmental approach in entrepreneurship research and support the idea that entrepreneurship can be promoted early in life. The findings are discussed against the backdrop of the economic and societal values that entrepreneurship has in today's societies.