Likelihood inference for exchangeable continuous data with covariates and varying cluster sizes; use of the Farlie–Gumbel–Morgenstern model

This article investigates the Farlie–Gumbel–Morgenstern class of models for exchangeable continuous data. We show how the model specification can account for both individual and cluster level covariates, we derive insights from comparisons with the multivariate normal distribution, and we discuss maximum likelihood inference when a sample of independent clusters of varying sizes is available. We propose a method for maximum likelihood estimation which is an alternative to direct numerical maximization of the likelihood that sometimes exhibits non-convergence problems. We describe an algorithm for generating samples from the exchangeable multivariate Farlie–Gumbel–Morgenstern distribution with any marginals, using the structural properties of the distribution. Finally, we present the results of a simulation study designed to assess the properties of the maximum likelihood estimators, and we illustrate the use of the FGM distributions with the analysis of a small data set from a developmental toxicity study.     

Do Generous Welfare States Generate Efficiency Gains which Counterbalance Short Run Losses? Testing Downside Risk Theory with Economic Panel Data for the U.S., Germany and The Netherlands

The purpose of the paper is to assess the theory that the downside risk insurance provided by more generous welfare states generates long run efficiency gains, which counterbalance the short run efficiency losses caused by work disincentives in these states (Feldstein 1974, 1976; Sinn 1995, 1996). Testing downside risk theory requires long term data, so the paper makes use of the three longest running national socio-economic panel surveys. These are the American Panel Study of Income Dynamics (PSID, 1968-), the German Socio-Economic Panel (1984-) and the Dutch Socio-Economic Panel (SEP, 1984-). The paper focusses on prime age households (heads 25–59) and assesses their participation in and returns to adult education and job training. Our results indicate some support for the theory in so far as Dutch and German prime age adults, living in more generous welfare states, were much more likely than Americans to take the risk of foregoing current earnings and investing in additional education. In all three countries returns on investment were substantial.

Pet Dogs Benefit Owners’ Health: A ‘Natural Experiment’ in China

This paper reports results from a ‘natural experiment’ taking place in China on the impact of dogs on owners’ health. Previous Western research has reported modest health benefits, but results have remained controversial. In China pets were banned in urban areas until 1992. Since then dog ownership has grown quite rapidly in the major cities, especially among younger women. In these quasi-experimental conditions, we hypothesise that dog ownership will show greater health benefits than in the West. Results are given from a survey of women aged 25–40 in Beijing, Shanghai and Guangzhou (N = 3031). Half the respondents owned dogs and half did not. Owners reported better health-related outcomes. They exercised more frequently, slept better, had higher self-reported fitness and health, took fewer days off sick from work and were seen less by doctors. The concluding section indicates how these results may be integrated and suggests further research on the potential economic benefits of pets.

Organizational construction of intrinsic motivation

Some psychological theorists claim that the worker's level of intrinsic motivation or alienation stems from the meeting between universal drives and personality characteristics and the material attributes of job tasks. Social theorists—focusing on organizational socialization and cultural practices—emphasize the firm's capacity to manipulate the meaning of a task independent of its material qualities. This social construction of a task's meaning may shape the intrinsic rewards a worker associates with it. Little empirical evidence exists that clarifies the conditions under which the psychological or the social model holds, particularly the conditions under which socialization practices within the firm can shape the worker's level of intrinsic motivation associated with specific tasks. We argue that the intrinsic value associated with a task is determined by its centrality to and fit with the organization's normative social and technical structure. Based on a study of eighty-four staff members within a bureaucratic organization we found that workers perceived high levels of intrinsic value for tightly controlled and routine tasks when the firm's rationalized methods of organizing were seen as legitimate. This interaction operated independently of the direct (usually negative) influence of task control on intrinsic value. A contingency model of intrinsic motivation is proposed, taking into account both the material structure of a work task and its fit with the firm's social and technical structure. Here the perceived legitimacy of the organization's structure conditions whether tightly controlled and routine tasks are viewed as alienating or as intrinsically motivating.     

A self psychological approach to the treatment of gay men with AIDS

This paper applies the concepts and techniques of the self psychological approach to the treatment of gay men with AIDS. The psychosocial impact of AIDS on the maintenance of self and identity for gay men is explored with an emphasis on the implications for selfobject needs being met. The author illustrates through four case vignettes attempts at satisfying the mirroring, idealizing, and alterego selfobject needs of such clients. Individual, relational, and family-focused clinical concerns are addressed.