Development of a Standard Soil-to-Skin Adherence Probability Density Function for Use in Monte Carlo Analyses of Dermal Exposure

It has recently been suggested that "standard" data distributions for key exposure variables should be developed wherever appropriate for use in probabilistic or "Monte Carlo" exposure analyses. Soil-on-skin adherence estimates represent an ideal candidate for development of a standard data distribution: There are several readily available studies which offer a consistent pattern of reported results, and more importantly, soil adherence to skin is likely to vary little from site-to-site. In this paper, we thoroughly review each of the published soil adherence studies with respect to study design, sampling, and analytical methods, and level of confidence in the reported results. Based on these studies, probability density functions (PDF) of soil adherence values were examined for different age groups and different sampling techniques. The soil adherence PDF developed from adult data was found to resemble closely the soil adherence PDF based on child data in terms of both central tendency (mean = 0.49 and 0.63 mg-soil/cm²-skin, respectively) and 95th percentile values (1.6 and 2.4 mg-soil/cm²-skin, respectively). Accordingly, a single, "standard" PDF is presented based on all data collected for all age groups. This standard PDF is lognormally distributed; the arithmetic mean and standard deviation are 0.52 ± 0.9 mg-soil/cm²-skin. Since our review of the literature indicates that soil adherence under environmental conditions will be minimally influenced by age, sex, soil type, or particle size, this PDF should be considered applicable to all settings. The 50th and 95th percentile values of the standard PDF (0.25 and 1.7 mg-soil/cm²-skin, respectively) are very similar to recent U.S. EPA estimates of "average" and "upper-bound" soil adherence (0.2 and 1.0 mg-soil/cm²-skin, respectively).     

American trade unions and public approval: Can unions please all of the people all of the time?

Public opinion about labor unions has long been viewed as an important determinant of industrial relations outcomes. Yet, analyses of changes in union popularity over time have been largely qualitative and have focused on the impact of short-term idiosyncratic events. This paper provides a quantitative analysis of the determinants of American public approval of unions from 1936 to 1991. Hypotheses relating to the union wage advantage, strike activity, the national unemployment rate, and World War II, receive the strongest support. The implications of these results for organized labor and future research on attitudes toward unions are discussed.     

An extension of the Dirichlet prior for the analysis of longitudinal multinomial data

Studies producing longitudinal multinomial data arise in several subject areas. This article suggests a Bayesian approach to the analysis of such data. Rather than infusing a latent model structure, we develop a prior distribution for the multinomial parameters which reflects the longitudinal nature of the observations. This distribution is constructed by modifying the prior that posits independent Dirichlet distributions for the multinomial parameters across time. Posterior analysis, which is implemented using Monte Carlo methods, can then be used to assess the temporal behaviour of the multinomial parameters underlying the observed data. We test this methodology on simulated data, opinion polling data, and data from a study concerning the development of moral reasoning.     

On adaptive estimation

Point estimates that are weighted averages of other estimates are considered. They are adaptive because the weights are also functions of the sample observations.In particular, the weights are functions of new measures of peakedness and skewness. Five adaptive estimators are compared (in a Monte Carlo study using the swindle) to some of the usual estimators, including those robust ones of Huber and Tukey. In addition, the swindle constant is considered in some detail. All of the adaptive estimators do extremely well with an adaptive biweight statistic being the best one in this study. Suggestions are made about future directions in this area.     

Making Global Society: Friendship Networks among Transnational Professionals in the Building Design Industry

Abstract Little is currently known about the nature and wider implications of transnationalism among professionals, despite the fact that companies are increasingly establishing overseas business links, seeking foreign contracts and obliging professional employees to work overseas for long periods of time. Focusing on the research generated by a small study of mainly architects and engineers who had worked abroad at some time in the building design industry in this article I explore their transnational experiences and the factors that enabled them to construct viable friendship networks extending over time and into global life. These experiences are briefly contrasted with the social processes constructed by migrants and others operating in transnational social space. Though professionals appear to lack the clear sense of collective unity, the pre‐existing identity and/or the same sense of membership and organization as other types of transnational communities may exhibit, these networks nevertheless demonstrated a high degree of sociality and affectivity and a capacity to generate further transnational relationships. They also revealed a strongly postnational orientation arising from the conjunction of a unique combination of shared factors especially age, emotional deprivation, location and the nature of overseas work.     

Traditional Managerial Activities and Interscholastic Athletic Directors: Examining the Differences,Similarities, and Connections between Engagement,Gender, and Success of High School Sports Administrators

The business realities of operating an interscholastic athletic program suggest that there is a rise in the behavioral similarities among traditional business managers and sport managers. This study explored how interscholastic athletic directors allocated their time when engaged in managerial activities; determined if gender influenced behavior; and to what extent the level of engagement in those activities influenced success. The findings indicated most of their time was spent on traditional management activities and the least time engaged in networking. Gender differences did not exist, however, the time spent on traditional management activities was positively correlated to success.     

The challenge of training in applied sociology

This paper adds to the current dialogue in our discipline regarding the challenge of expanding nonacademic employment opportunities for sociologists and training our students for such employment. The argument is made that this challenge should be seen as an opportunity for us to demonstrate the relevance of our knowledge and expertise to society and to advance the intellectual development of our discipline. Moreover, the achievement of these benefits does not require sacrificing the distinctive intellectual core of sociology as a humanistic liberal arts discipline. To help bridge the gap between academic and nonacademic cultures, several interrelated strategies are suggested that address issues of marketing and public relations, as well as curriculum revision. The internship, as a key feature of “applied” programs, is crucial in terms of both training students and facilitating our contacts with potential employers. where he developed the department’s internship program, and has done consultation with religious and social service organizations. where he helped develop the Master’s program in applied sociology, and has done extensive consultation with business organizations regarding their needs for sociological skills and expertise. which is jointly sponsored by the College of Business and Management and the Department of Sociology, and which conducts studies in organizational design, entrepreneurship, and strategic management at the University of Maryland in College Park. has done extensive consultation and research with business organizations and the military on personnel and family issues. in Jacksonville and utilizes sociological concepts in courses on organizational management and design. a member of the ASA Ad Hoc Committee on Under- and Un-employment. where he recently completed a term as Head of the Department and a leave of absence to the staff of the Joint Economic Committee of the U.S. Congress.     

Evolution of recurrent asthma event rate over time in frailty models

Summary. To model the time evolution of the event rate in recurrent event data a crucial role is played by the timescale that is used. Depending on the timescale selected the interpretation of the time evolution will be entirely different, both in parametric and semiparametric frailty models. The gap timescale is more appropriate when studying the recurrent event rate as a function of time since the last event, whereas the calendar timescale keeps track of actual time. We show both timescales in action on data from an asthma prevention trial in young children. The frailty model is further extended to include both timescales simultaneously as this might be most relevant in practice.