VOLUNTARY ASSOCIATION MEMBERSHIP AMONG BLACK AMERICANS: THE POST-CIVIL RIGHTS ERA

This article discusses voluntary association membership among black Americans in the post-civil rights era. Previous empirical studies comparing black to white social participation are critically assessed. A model composed of social class and intragroup regionality variables is offered to explain membership patterns as a manifestation of vertical and horizontal differentiation in the black American social structure. The analysis of empirical data collected by telephone interviews (N= 321) in a southwest Chicago community revealed that education most accurately predicts membership across associations but that occupation and regionality are also important variables. The analysis showed that members of church groups and civil rights groups are likely to be women from the rural South with at least 12 years of education. These findings suggest that explanations of black American life in the post-civil rights era may wish to consider vertical as well as horizontal differentiation.     

Interpersonal Influences on Students' Academic and Career Decisions: The Impact of Sexual Orientation

The authors investigated differences in interpersonal influences on career decision making between gay, lesbian, and bisexual (GLB) and heterosexual college students. Contrary to hypotheses, GLB students reported having more career role models than did heterosexual students, and the amount of inspiration received from role models did not differ between the 2 groups. However, GLB students perceived they received less support and guidance from others in their academic and career decision making. As expected, GLB students were more likely to endorse the importance of a career role model's sexual orientation and support of people with their own sexual orientation. Career intervention and research implications are discussed.     

Packaging effective community service delivery: the utility of mandates and contracts in obtaining administrative cooperation

Voluntary agreements, mandates, and contracts integrate networks of social service organizations, allowing them to function as coordinated wholes. The author reviews the history of contracting and mandating in the public sector. It is hypothesized that contracted relationships formalize agreements between local organizations dependent on others. Mandated relationships are perceived to be important by policy-makers at a state or federal level. The differential acceptance and rejection of these relationships in the community is explored. Data from social service agencies are used to compare administrators' assessments of the effectiveness of mandated and contracted relationships used to coordinate a group of agencies delivering services to children. When a mandated relationship has been formalized into a contract by a local administrator the perceived effectiveness of that relationship is higher than any other relationship in the community. If the mandated relationship has not been formalized by a contract this relationship is perceived to be the least effective. Important mandated inter-organizational ties without monetary incentives are less likely to work. Local administrators having developed the contracted ties see these ties as producing a higher level of performance.     

Social physique anxiety, obligation to exercise, and exercise choices among college students

OBJECTIVE: The authors examined relationships among social physique anxiety, obligation to exercise, and exercise choices. PARTICIPANTS AND METHODS: College students (N = 337; 200 women, 137 men) volunteered to complete 3 questionnaires: the Social Physique Anxiety Scale (SPAS), Obligatory Exercise Questionnaire (OEQ), and Physical Activity Specification Survey (PASS). RESULTS: On the SPAS, men (M score = 31.9 +/- 8.8) differed from women (M score = 37.3 +/- 8.3; p = .001). Men (M score = 43.0 +/- 9.9) and women (M score = 43.0 +/- 9.6) responded similarly (p = .94) on the OEQ. There was no interaction between sex and exercise level on the SPAS or OEQ. When separated by low, medium, and high SPAS scores, neither OEQ nor exercise scores differed. CONCLUSIONS: Obligation to exercise appears to be similar for both sexes. Women, however, appear to have higher levels of anxiety regarding how others evaluate their physique than do men. The combination of level of activity and sex do not appear to be associated with social physique anxiety or obligation to exercise.     

Semi‐Parametric Models for the Multivariate Tail Dependence Function – the Asymptotically Dependent Case

Abstract. In general, the risk of joint extreme outcomes in financial markets can be expressed as a function of the tail dependence function of a high‐dimensional vector after standardizing marginals. Hence, it is of importance to model and estimate tail dependence functions. Even for moderate dimension, non‐parametrically estimating a tail dependence function is very inefficient and fitting a parametric model to tail dependence functions is not robust. In this paper, we propose a semi‐parametric model for (asymptotically dependent) tail dependence functions via an elliptical copula. Under this model assumption, we propose a novel estimator for the tail dependence function, which proves favourable compared to the empirical tail dependence function estimator, both theoretically and empirically.     

Screening for Chlamydia trachomatis in college women on routine gynecological exams.

Chlamydia trachomatis infection poses a serious threat to sexually active college women. Past research has demonstrated the difficulty of predicting infection on the basis of symptoms or physical exam. Recent studies highlight the prevalence of asymptomatic chlamydia infections. This study presents the results of screening 2,303 women for chlamydia infection on routine annual gynecological examinations at a college health center during a 22-month period. A prevalence of 6% was found. The study also assessed the differences between the 140 women identified as chlamydia positive and a control sample of 140 women who were chlamydia negative. The authors compared groups for signs and symptoms that might predict infection, but found no useful predictors. In fact, 79% of the patients who tested positive had no symptoms, and 58% of these had no signs, symptoms, or concurrent infections. Routine screening of women on annual gynecological exam is necessary to bring the chlamydia epidemic under control, the authors conclude.     

The use of a single pseudo-sample in approximate Bayesian computation

We analyze the computational efficiency of approximate Bayesian computation (ABC), which approximates a likelihood function by drawing pseudo-samples from the associated model. For the rejection sampling version of ABC, it is known that multiple pseudo-samples cannot substantially increase (and can substantially decrease) the efficiency of the algorithm as compared to employing a high-variance estimate based on a single pseudo-sample. We show that this conclusion also holds for a Markov chain Monte Carlo version of ABC, implying that it is unnecessary to tune the number of pseudo-samples used in ABC-MCMC. This conclusion is in contrast to particle MCMC methods, for which increasing the number of particles can provide large gains in computational efficiency.     

Intellectual ability and reactions to pornography

Two studies examined the relation between intelligence and men's sexual attitudes and interpersonal behavior with a woman after viewing pornography. Undergraduate men were assessed for IQ, viewed one of several films, then were assessed on various dependent measures, including interpersonal behavior with a female confederate. Lower IQ men were more sexually suggestive to the woman after viewing a sexually violent film than after viewing an nonviolent erotic film; higher IQ men did not differ in suggestiveness as a function of sexual film condition. In Study 2, lower IQ men were also physically closer to the woman after viewing a violent sexual film than after viewing a nonviolent erotic film; higher IQ men were less variable in proximity as a function of film condition. Results are discussed in relation to research suggesting that intelligence moderates influenceability, and to sex education programs that help individuals critically evaluate antisocial content in the sexual media.