DISTRIBUTION FREE MULTIPLE COMPARISONS FOR MONOTONICALLY ORDERED TREATMENT EFFECTS

A method of calculating simultaneous one-sided confidence intervals for all ordered pairwise differences of the treatment effects_j–_i, 1 i < j k, in a one-way model without any distributional assumptions is discussed. When it is known a priori that the treatment effects satisfy the simple ordering_1k, these simultaneous confidence intervals offer the experimenter a simple way of determining which treatment effects may be declared to be unequal, and is more powerful than the usual two-sided Steel-Dwass procedure. Some exact critical points required by the confidence intervals are presented for k= 3 and small sample sizes, and other methods of critical point determination such as asymptotic approximation and simulation are discussed.     

Estimating the concordance probability in a survival analysis with a discrete number of risk groups

A clinical risk classification system is an important component of a treatment decision algorithm. A measure used to assess the strength of a risk classification system is discrimination, and when the outcome is survival time, the most commonly applied global measure of discrimination is the concordance probability. The concordance probability represents the pairwise probability of lower patient risk given longer survival time. The c-index and the concordance probability estimate have been used to estimate the concordance probability when patient-specific risk scores are continuous. In the current paper, the concordance probability estimate and an inverse probability censoring weighted c-index are modified to account for discrete risk scores. Simulations are generated to assess the finite sample properties of the concordance probability estimate and the weighted c-index. An application of these measures of discriminatory power to a metastatic prostate cancer risk classification system is examined.     

Epidemiologic network inference

Statistics and Computing - In many epidemiologic models, a disease is assumed to spread along a contact network. We aim to infer this network, in addition to the epidemiologic model parameters,...     

Modeling Phytosanitary Risk of Unintended Commodity Use: The Example of U.S. Potato Exports to Mexico

Diversion of commodities from their intended use to an unintended use, e.g., when commodities intended for consumption are used as seed for planting, is an important issue in agricultural trade that has implications for the establishment of pests and pathogens in an importing country and for the appropriate strength of plant health measures. Consequently, understanding and accurately characterizing the risk of diversion from intended use is highly relevant to policymakers, trading partners, and in trade dispute arbitration. To our knowledge, no risk assessments have ever accounted for the likelihood of diversion from intended use. Here we present an approach to analyzing this risk using diversion of U.S. table stock potatoes to seed for planting by Mexican potato producers as a case study. We use probabilistic pathway models to characterize the movement of white, yellow, and russet potatoes from the United States into Mexico at current and double export volumes. We then model the likelihood of these potatoes being diverted for seed and the subsequent establishment of bacteria, nematode, and virus pests in Mexico. Our approach demonstrates how diversion from intended use can be quantified in one scenario and, in particular, how it can be analyzed to estimate the magnitude of diversion required to produce a high risk of pest establishment.     

The Effect of Absentee Ownership on Local Employment Change

Abstract

To determine whether absentee-owned firms destabilize local economies, we examine the relationship between absentee ownership of manufacturing companies and employment change in manufacturing for 109 Pennsylvania towns. This issue arises because some earlier studies find that corporate connections through absentee-owned firms are positively related to local employment growth, whereas other work claims that locally owned operations are more stable. We attempt to reconcile these findings by arguing that absentee ownership is destabilizing only in the case of non-conglomerate firms. Our results show that absentee ownership in fact increases the closure rate of firms, thereby negatively affecting manufacturing employment change. Yet, this relationship differs by the parent company's organizational structure. Employment in branches of non-conglomerate firms is more detrimental than employment in branches of conglomerates — an important qualification of the argument that the “conglomeratization” of advanced industrial societies negatively affects communities.     

An interprofessional internship model for training master’s level social work and counseling students in higher education settings

ABSTRACT

The mental health needs of college students are steadily on the rise, which compels mental health service providers and educators to explore innovative ways to provide more collaborative, supportive, and interdisciplinary service models of practice and professional training. Graduate programs in social work and counseling are at the crux of producing internship training programs to help accommodate the influx of students with persistent mental health concerns across a variety of needs and cultures. This article describes an interprofessional internship program structured and designed to meet the clinical training needs of master’s level students matriculating in social work and counseling who aspire to provide mental health services in higher education settings. The interprofessional internship training model proposes an innovative interdisciplinary approach to field education which may result in positive training outcomes and learning experiences for social work and counseling students. This paper discusses the model’s emphasis on individual and interdisciplinary group supervision, objectives of the internship experience, internship site criteria, and professional and personal benefits to pre-service social workers and counselors. Recommendations for training and limitations of the model are provided.     

Organizing stories of organizational life: four films on american business

Film-makers verge on the ethnographical in their study of organizations. This paper discusses four films about business, and how the film-makers invoked a narrative strategy to portray contemporary perspectives on organizational life during the emergence of post-modern society. The remembered shards of a life in The Power and Glory (1933) reflected America's ambiguity towards robber barons. The comedy of manners surrounding the middling clerk in The Apartment (1960) conveyed America's questions about White Collar life. The quest for a voice to speak out against the system in The China Syndrome (1979) beat to the electronic countdown pace of the self-destruction of a nuclear reactor. The historical realism of Wall Street (1987) overwhelmed the viewer with information about a system where information is money.