Trends in Student-Faculty Ratios and the Use of Non-Tenure-Track Faculty in MSW Programs

This article reports on a study of enrollment trends, staffing patterns, and student-faculty ratios in master’s degree programs in social work and three related fields. Results for MSW programs show (a) that the median ratio of students to faculty in MSW programs has grown 36% since 1981 and, for the past five years, has exceeded the Council on Social Work Education’s recommended maximum; (b) that since 1978, the number of full-time tenure-track faculty has declined by nearly 8% despite sharply increased student populations; and (c) that the number of part-time faculty has increased, but not in proportion to the number of students. None of the related fields examined in this study showed a similar combination of enrollment growth and full-time faculty decline.     

Are Boards Designed to Fail? The Implausibility of Effective Board Monitoring

In this review, we challenge the idea that directors are well positioned to be effective monitors of management. Moving beyond the logic of incentives and ability, we conceptualize a model based on the premise of boards as groups of individuals obtaining, processing and sharing information and explain how variation in information-processing demands at the director, board and firm level may challenge effective monitoring. We draw on multiple theoretical perspectives to identify these barriers to effective board monitoring. Our goal in reviewing these barriers is to help us take stock of existing research in corporate governance and to better explain board behavior beyond traditional agency and resource dependency accounts. We also aim to uncover gaps in the conceptual and empirical research and suggest areas of fruitful future research.     

A bayesian approach to dynamic tobit models

This paper develops a posterior simulation method for a dynamic Tobit model. The major obstacle rooted in such a problem lies in high dimensional integrals, induced by dependence among censored observations, in the likelihood function. The primary contribution of this study is to develop a practical and efficient sampling scheme for the conditional posterior distributions of the censored (i.e., unobserved) data, so that the Gibbs sampler with the data augmentation algorithm is successfully applied. The substantial differences between this approach and some existing methods are highlighted. The proposed simulation method is investigated by means of a Monte Carlo study and applied to a regression model of Japanese exports of passenger cars to the U.S. subject to a non-tariff trade barrier.     

A SEMIPARAMETRIC DISCRETE CHOICE MODEL: AN APPLICATION TO HOSPITAL MERGERS

We propose a computationally simple semiparametric discrete choice estimator to model rich consumer heterogeneity. We assume groups of observably similar consumers have similar preferences, but allow preferences to vary freely across these groups. Model flexibility is easily adjusted by setting a single tuning parameter; we suggest a cross‐validation method to do so. We analyze the model's properties in the context of hospital mergers, both analytically and via a Monte Carlo analysis. The model performs well for policy relevant substitution and welfare measures, even if misspecified, when the tuning parameter is set within the neighborhood of the value chosen by cross validation. (JEL C14, D12, I11, L41)     

Perceptions of and Reactions to the Homeless: A Survey of Fourth-Grade,High School,and College Students in a Small Midwestern Community

A total of 459 fourth-graders, high school students, and undergraduates completed a Homelessness Questionnaire developed for use in this study. Although participants generally expressed positive and supportive attitudes toward the homeless, attributing homelessness to either social maladjustment (e.g., drug problem) or negative characteristics (e.g., laziness) within the homeless was positively associated with “fear of and anger toward the homeless” for all groups of participants. In addition, perceptions of and reactions to the homeless were influenced by both the participants’ gender and age group. Although high school and college students’ interest in helping the homeless was associated with various attitudes and reactions (e.g., feelings of sympathy/support), their indication that they had ever helped homeless people (either directly or indirectly) was consistently associated only with the acknowledgment that their mother and father had ever helped homeless people (either directly or indirectly). Among these older participants, homelessness in the United States was rated as a more serious problem at the end of the questionnaire than at the beginning.     

Influence of human population size and the built environment on avian assemblages in urban green spaces

While studies of how habitat patch dynamics structures avian communities in urban environments has received some attention, there is considerably less known of how the built environment and human population size may influence the structuring of urban bird communities. We investigated bird populations in Pittsburgh, Pennsylvania (U.S.A.) through replicated point count surveys of breeding birds in 50 parks and cemeteries of varying sizes. We counted 4,435 individual birds in 441 counts. Of the 61 species detected, 27 were rare (detected at <8 points). Migratory species accounted for 46.1 % of all individuals, while 23.2 % of all individuals were of introduced species. Species richness increased significantly with green area size, as did the number of rare species. Species diversity decreased significantly with an increase in the proportion of individuals of introduced species; in particular, cavity nesters were less abundant when introduced species were present. Elements of the built urban environment including commercial development and transportation corridors were associated with significant reductions in park-wide species richness, mean number of species per point, and mean number of individual birds recorded per point. Human population size was positively related to increased numbers of individuals of introduced species, but a lower mean number of species per point. Ours is among the first to identify specific relationships between avian population characteristics and human population size, as few other studies have specifically incorporated human population size into a local, fine grain study design. Our data suggest that human population size is an important parameter that can be measured independently of characteristics of the built environment and the physical characteristics of the park itself as a correlate of avian diversity and abundance. Our study points to a variety of trade-offs needed to manage habitat for birds in urban settings.     

Unscrambling Africa: Regional Requirements for Achieving Food Security

Africa has inherited highly arbitrary political borders that vastly complicate current efforts to accelerate agricultural growth and reduce hunger. By partitioning agro‐ecological zones and natural market sheds, current borders serve as barriers, hampering agricultural technology transfer, hindering agricultural trade and dampening incentives for farmers and agribusinesses to invest in Africa's many regional bread‐basket zones. Feasible solutions revolve around neutralising these deleterious effects through regional scientific networks and corridor development programmes.