The minimum regularized covariance determinant estimator

Statistics and Computing - The minimum covariance determinant (MCD) approach estimates the location and scatter matrix using the subset of given size with lowest sample covariance determinant. Its...     

Eating disorders and academic performance among college students

Abstract

Objective: There is a paucity of research exploring eating disorders (EDs) and academic performance (AP). This study aimed to understand the effect of ED treatment on AP, hypothesizing that students receiving treatment for EDs would have a higher GPA. Participants: The Spring 2010 – Spring 2011 National College Health Assessment data (N?=?231,586) was utilized. Methods: Ordinal logistic regressions, controlling for key confounders, analyzed the association between those diagnosed with anorexia or bulimia and GPA. Results: Students diagnosed with anorexia or bulimia and treated with medication and psychotherapy were respectively 1.49 (1.24, 1.80; p?<?.0001) or 1.35 (1.13, 1.61; p?=?.0009) times more likely to have a higher GPA (p?<?.0001) compared to students without EDs. Conclusion: Findings expand the literature on EDs and AP among college students. Additional research is needed to determine whether the combination of medication and psychotherapy is the most effective way to improve AP among students with EDs.     

The Contours and Correlates of Informal Work in Rural Pennsylvania*

Abstract Social scientists have increasingly come to recognize the informal economy as a prominent and permanent structural feature of modern society. Rural sociologists have made a considerable contribution to this literature, demonstrating informal work to factor prominently in the livelihood strategies of rural Americans. Despite this scholarly attention significant gaps persist in our understanding of the informal economy. Drawing on data from a survey of family households in nonmetropolitan Pennsylvania, this paper examines the contours and correlates of informal work. The results make a strong case that participation in informal work is widespread and most often combined with formal work as a household livelihood strategy. While income is not found to be a significant correlate of informal work, it is found to influence the reasons cited for participation. Important correlates of informal work are identified and differences in the factors associated with informal work done to generate income (cash or in‐kind) versus savings are revealed.     

Extended voting measures

This paper extends a number of voting measures used to quantify voting power. The extension is based on the recognition that individuals sometimes vote in coalitions. This observation gives rise to a statistical model which considers past voting patterns of subsets of eligible voters. The model is then used to obtain estimates of the probabilities of all voting combinations from which empirical measures are calculated. The calculation of the estimated probabilities may involve high-dimensional integrations. An example is given based on past decisions arising from the Supreme Court of Canada.     

Psychometric Evaluation of the Affect Regulation Checklist: Clinical and Community Samples,Parent-Reports and Youth Self-Reports

The Affect Regulation Checklist (ARC) was designed to capture affect dysregulation, suppression, and reflection. Importantly, affect dysregulation has been established as a transdiagnostic mechanism underpinning many forms of psychopathology. We tested the ARC psychometric properties across clinical and community samples and through both parent-report and youth self-report information. Clinical sample: Participants included parents (n = 814; M_age = 43.86) and their child (n = 608; M_age = 13.98). Community sample: Participants included independent samples of parents (n = 578; M_age = 45.12) and youth (n = 809; M_age = 15.67). Exploratory structural equation modeling supported a three-factor structure across samples and informants. Dysregulation was positively associated with all forms of psychopathology. In general, suppression was positively associated with many forms of psychopathology, and reflection was negatively associated with externalizing problems and positively associated with internalizing problems.     

Truly embodied sociology: marrying the social and the biological?

This paper explores the relation between sociology and biology through an examination of issues relating to the sociology of the body, emotion and health. Arguments for a ‘biological’, and yet social, body are considered before developing a critique of work on the sociology of the biological body. It is argued that there are a number of difficulties with this latter project. Writers working in this area can be seen to have used rather emotional ploys to advance their promotion of a more ‘biologised’, or ‘material‐corporeal’, account of the body, emotion and health. In addition though these writers eschew reductionist, naturalist, and dualist arguments, they nevertheless draw on studies that have some or all of these characteristics. Finally a variety of epistemological and methodological difficulties inherent in physiological analysis and in ‘interviewing’ the body are explored. It is concluded that we still remain near the ‘starting point’ of a sociology of the body that interrelates biology and sociology.     

Being close to ethnic peers: the formation of ethnic residential clustering from a household perspective

To assess the impact of segregation a better understanding is required why minorities and natives decide to move closer to ethnic peers. This study investigates the drivers for ethnic residential clustering from a household perspective. For this, household panel data for Germany is linked to small-scale information on the share of co-ethnic neighbours and to the number of regional housing offers and requests. As a result, life-course changes and indicators of cultural openness show similar effects on ethnic residential clustering for migrants and natives. For both, becoming married, inter-ethnic partnerships and moving out of the parental home lead to lower shares of neighbours with the same ethnic background. Major differences exist regarding contextual factors. Natives are more likely to self-segregate in times of increasing housing supply while migrants seem to face limitations in access to housing in times of increasing housing demand. The results highlight the importance of the housing market and the relation of moving choices between migrants and natives in the formation of ethnic residential clustering.