A diagnostic for selecting the threshold in extreme value analysis

A new approach is suggested for choosing the threshold when fitting the Hill estimator of a tail exponent to extreme value data. Our method is based on an easily computed diagnostic, which in turn is founded directly on the Hill estimator itself, 'symmetrized' to remove the effect of the tail exponent but designed to emphasize biases in estimates of that exponent. The attractions of the method are its accuracy, its simplicity and the generality with which it applies. This generality implies that the technique has somewhat different goals from more conventional approaches, which are designed to accommodate the minor component of a postulated two-component Pareto mixture. Our approach does not rely on the second component being Pareto distributed. Nevertheless, in the conventional setting it performs competitively with recently proposed methods, and in more general cases it achieves optimal rates of convergence. A by-product of our development is a very simple and practicable exponential approximation to the distribution of the Hill estimator under departures from the Pareto distribution.     

The Impact of Temporary Labor Migration on Mexican Children's Educational Aspirations and Performance1

This article examines how temporary U.S. labor migration by family members and by students affects the educational aspirations and performance of those same students growing up in Mexican migrant communities. Labor migration affects these children in two ways. First it brings remitted U.S. earnings into the household which allows parents to provide more education for their children and reduce the need for children's labor. Higher incomes are also associated with numerous factors that improve the general well‐being of children, as reflected in various indicators including higher school grades. Labor migration also has negative impacts on children. In addition to family stress and behavioral problems with adolescents due to parental and sibling absence, migration provides an example of an alternative route to economic mobility. Children growing up in migrant households have access to information and social networks that reduce their likelihood of migration failure should they choose this alternative to the Mexican labor market. We analyze a unique data set from a stratified random sample of 7600 grammar, junior high, and high school‐level students in a state capital, a large town, and 25 rural communities in a Mexican migrant‐sending state. We find that high levels of U.S. migration are associated with lower aspirations to attend a university at all academic levels. We find, however, a positive relationship between U.S. migration and grades. We conclude that while U.S. migration provides financial benefits that allow children to continue schooling and perform well, it may also reduce the motivation to attain above‐average years of schooling.     

The issue of consent in research that administers drugs of addiction to addicted persons

In addiction, impaired control over drug use raises questions about the capacity of addicted persons to consent to participate in research studies in which they are given their drug of addiction. We review the case for doing such research, and the arguments that addiction does, and does not, prevent addicted persons from consenting to such research. We argue for a more nuanced view that acknowledges that while in some situations addiction impairs decision-making capacity, it does not eliminate such capacity. We conclude with some suggestions for recruiting addicted subjects and designing experiments in ways to obtain free and informed consent.     

On the Addition and Comparison of Graphs Labeled with Stochastic Variables: Learnable Anatomical Catalogs

We provide an operator for the addition of a pair of graphs, labeled with continuous variables which are subject to stochastic variation. We also provide an operator for measuring dissimilarity between a pair of such graphs. We use such a representation and operators to model a collection of vascular anatomy which accounts for inter-individual variations in both branching structure and in vessel shape. The model may be incrementally acquired, and is thus a catalog of anatomy whose content may be learned. The model may be used in applications such as the reconstruction of vasculature in three-dimensions from x-ray images, which we briefly outline.     

The Role of Social Contact in the Experience of Discrimination: Implications for Subjective Health Among Marriage Migrant Women in South Korea

Several studies have found that various social contexts could serve a protective role for minorities facing discrimination. One of these contexts is frequency of social contact, which is known to be positively associated with health outcomes. The purpose of this study was to examine the frequency of social contact with various social groups as a protective factor against the negative association between perceived discrimination and subjective health. Using data from the 2009 Korean National Survey of Multicultural Families, a total of 27,083 marriage migrant women were analyzed via hierarchical multiple regression. After controlling for socio‐demographic factors and Korean proficiency, the experience of discrimination was found to be significantly associated with lower levels of subjective health (B = ?0.22; P < 0.001). More frequent meetings with one's family of origin (B = 0.02; P < 0.01) and in‐laws (B = 0.06; P < 0.001) were associated with higher levels of subjective health, while more frequent meetings with neighbors were negatively associated (B = ?0.02; P < 0.001). More frequent contact with one's family of origin (B = 0.03; P < 0.05), rather than with other groups, such as friends from their country of origin, in‐laws, and neighbors, seemed to reduce the negative influence of discrimination on subjective health.     

Qualitative exploration of the nature of grief-related beliefs and expectations

Societal expectations of grief impact the experience of bereavement. The congruence of societal expectations with current scientific understanding of grief is unknown. Therefore two qualitative studies explored community perceptions of grief. In study one, three small focus groups (N = 9) examined grief-related expectations associated with hypothetical scenarios of bereavement. In study two, the impact of grief-related perceptions on the lived experience of bereavement for 11 individuals was explored through semi-structured interviews. Across both studies, elements of a traditional stage model view of grief were evident, with participants viewing emotional expression of grief as important. An avoidant coping style in the bereaved was considered problematic. Findings of study two suggested that grief-related beliefs may impact the bereavement experience via appraisal of the grief response and willingness to support bereaved individuals. The studies suggested that stage model assumptions in the beliefs of the general population persist, although there was a recognition of diversity in the grief response.     

Iowa Case Management for Rural Drug Abuse

OBJECTIVE: The purpose of this research was to evaluate the effectiveness of a comprehensive, strengths-based model of case management for clients in drug abuse treatment. METHOD: 503 volunteers from residential or intensive outpatient treatment were randomly assigned to one of three conditions of Iowa Case Management (ICM) plus treatment as usual (TAU), or to a fourth condition of TAU only. All were assessed at intake and followed at 3, 6, and 12 months. RESULTS: Clients in all four conditions significantly decreased substance use by 3 months after intake and maintained most gains over time. However, the addition of ICM to TAU did not improve substance use outcomes. CONCLUSION: Overall, the addition of case management did not significantly improve drug treatment as hypothesized by both researchers and clinicians. Some results were mixed, possibly due to the heterogeneous sample, wide range of case management activities, or difficulty retaining participants over time.     

Aftermath of tragic events: the development and use of community support meetings on a university campus

Colleges and universities need to be prepared to address the psychological impact of tragedies on their campuses. In this article, the author describes the development and successful implementation of campus postvention services in the aftermath of college student deaths by suicide as well as by natural and accidental causes. The program has been well received and has gone a long way toward helping the campus community come together and heal after these types of tragedies. College officials adapted the program to address issues related to troubling national and international events as well local incidents, such as suicide attempts and students' loss of housing through fires. The author provides specific instructions so that readers can replicate the program on their own campuses, and additional materials are available upon request.     

Characteristics of social smoking among college students

Social smoking is a newly identified phenomenon in the young adult population that is poorly understood. We investigated differences in social smoking (smoking most commonly while partying or socializing) and other smoking within a convenience sample of college smokers (n = 351) from a large midwestern university. Results revealed that 70% of 351 current (past 30-day) smokers reported social smoking. No significant difference was found in motivation to quit between smoking groups. However, a significant difference was found between groups in confidence to quit, the number of days smoked, and the number of cigarettes smoked on those days. More social smokers than expected did not perceive themselves as smokers. Logistic regression analysis revealed that lower physical and psychological dependence and higher social support scores predicted social smoking.