Evaluation of alternative confidence intervals to address non-inferiority through the stratified difference between proportions

The confidence interval (CI) for the difference between two proportions has been an important and active research topic, especially in the context of non-inferiority hypothesis testing. Issues concerning the Type 1 error rate, power, coverage rate and aberrations have been extensively studied for non-stratified cases. However, stratified confidence intervals are frequently used in non-inferiority trials and similar settings. In this paper, several methods for stratified confidence intervals for the difference between two proportions, including existing methods and novel extensions from unstratified CIs, are evaluated across different scenarios. When sparsity across the strata is not a concern, adding imputed observations to the stratification analysis can strengthen Type-1 error control without substantial loss of power. When sparseness of data is a concern, most of the evaluated methods fail to control Type-1 error; the modified stratified t-test CI is an exception. We recommend the modified stratified t-test CI as the most useful and flexible method across the respective scenarios; the modified stratified Wald CI may be useful in settings where sparsity is unlikely. These findings substantially contribute to the application of stratified CIs for non-inferiority testing of differences between two proportions.     

Body art,deviance, and American college students

This research examines the relationship between body art (tattoos and piercings) and deviance. With the increasing mainstream presence of visible tattoos and piercings among entertainers, athletes, and even in corporate boardrooms, we wonder the extent to which long-time enthusiasts and collectors regard the phenomenon as encroachment. We use sub-cultural identity theory to propose that individuals with increasing evidence of body art procurement will also report higher levels of deviant behavior in order to maintain and/or increase social distance from the mainstream. We tested this proposition by surveying 1753 American college students, asking them to report their level of body art acquisition and their history of deviance. Results indicate that respondents with four or more tattoos, seven or more body piercings, or piercings located in their nipples or genitals, were substantively and significantly more likely to report regular marijuana use, occasional use of other illegal drugs, and a history of being arrested for a crime. Less pronounced, but still significant in many cases, was an increased propensity for those with higher incidence of body art to cheat on college work, binge drink, and report having had multiple sex partners in the course of their lifetime.     

Utilizing research in professional practice

A review of the rehabilitation, disability studies, and allied health literature suggests the presence of numerous factors that impede the utilization of research by practitioners. The purpose of this article is to describe these factors and offer potential solutions that could enable rehabilitation professionals to integrate research findings into their practice. Specifically, the authors recommend strategies to (a) contextualize research throughout pre-service curricula, (b) establish researcher-stakeholder partnerships, (c) increase the accessibility of research to practitioners, and (d) establish professional and peer support for implementing research in field practice.     

Dependence maps: Local dependence in practice

There is often more structure in the way two random variables are associated than a single scalar dependence measure, such as correlation, can reflect. Local dependence functions such as that of Holland and Wang (1987) are, therefore, useful. However, it can be argued that estimated local dependence functions convey information that is too detailed to be easily interpretable. We seek to remedy this difficulty, and hence make local dependence a more readily interpretable practical tool, by introducing dependence maps. Via local permutation testing, dependence maps simplify the estimated local dependence structure between two variables by identifying regions of (significant) positive, (not significant) zero and (significant) negative local dependence. When viewed in conjunction with an estimate of the joint density, a comprehensive picture of the joint behaviour of the variables is provided. A little theory, many implementational details and several examples are given.     

Disability and job stress: Implications for vocational rehabilitation planning

Because people with disabilities often experience an increased risk for physical and psychological complications of job stress, vocational rehabilitation professionals must be able to (a) identify individual and work-environmental risk factors for job stress and (b) design appropriate interventions to minimize those risk factors. The purpose of this article is to (a) present two models of occupational stress, (b) examine factors common to each of these models that are associated with employee health and well-being, and (c) suggest implications for rehabilitation planning.     

College students and tattoos. Influence of image,identity, family,and friends

Tattoos are popular among many groups of people. College students from a large university in the southwestern United States were queried using the 134-item Armstrong Team Tattoo Attitude Survey. Findings documents a progressive increase in tattooing and reflect significant support for tattoos, even from non-tattooed students. Similar and positive demographic characteristics were present in individuals who were both non-tattooed and tattooed. In addition, tattooed people were viewed positively, even among non-tattooed respondents. Friends significantly affected procurement and possession of tattoos, whereas of all family members, the sister was the only significant influence. Overall, friends, identity, and image seem to be the major influences for obtaining tattoos.     

Criteria for the selection of reporting method

Identification of optimal reporting method by analysis requires that a criterion be available for selecting those ‘best’ practices which are to act as the norms for standardisation. ‘Predictive ability’ has been suggested as such a criterion. This article argues that ‘predictive ability’ should be rejected in favour of an overriding economic criterion for the design of reporting methods and information systems. An information system is only valuable as part of a wider system. This article proposes that the wider system in which we are interested must be ‘more valuable’ in contemplation of change than without it, if changes in information systems are to be justified.     

LABOR FORCE MIGRATION AND ALLOCATIVE EFFICIENCY IN THE UNITED STATES: THE ROLES OF INFORMATION AND PSYCHIC COSTS

This paper examines the relative importance of information, psychic and other costs of relocation as mitigating factors (off-sets to spatial earnings differentials) within the migration decision. The methodology employed for this examination is based upon: (1) observation of relationships between the geographic allocation and personal characteristics of labor force migrants, and (2) inferences, drawn from these observations, on the relative importance of various relocation cost components. Empirical analyses of the migration decision based upon this indirect methodology provide important insights on both the determinants and allocative efficiency of interstate labor force migration in the United States.