Bidirectional Relationships Between Parenting Processes and Deviance in a Sample of Inner‐City African American Youth

This study assessed bidirectional relationships among supportive parenting (knowledge), negative parenting (permissiveness), and deviance in a sample (N = 5,325) of poor, inner‐city African American youth from the Mobile Youth Survey over 4 years. Cross‐lagged path analysis provided evidence of significant bidirectional paths among parenting processes (knowledge and permissiveness) and deviance over time. Follow‐up multigroup tests provided only modest evidence of dissimilar relationships by sex and by developmental periods. The findings improve our understanding of developmental changes between parenting behaviors and deviance during adolescence and extend current research of the bidirectionality of parent and child relationships among inner‐city African American youth.     

Reward Seeking and Cognitive Control: Using the Dual Systems Model to Predict Adolescent Sexual Behavior

Research has provided support for the dual systems model of adolescent risk taking, but the model has rarely been applied to sexual behavior. Using data from the NICHD SECCYD (N = 958; Mage = 15.07, SD = 0.18), this study examined the effects of cognitive control, reward seeking, and their interaction on sexual behavior. Results of structural equation models revealed that performance on behavioral tasks assessing reward seeking and cognitive control uniquely predicted sexual intercourse, but the interaction between them was not significant. For oral sex, only cognitive control was a significant predictor. The findings provide additional support for the dual systems model, and suggest that reward seeking and cognitive control make unique contributions to adolescent sexual behavior.     

Open networks and secret Facebook groups: exploring cycle effects on activists’ social media use in the 2010/11 UK student protests

Abstract

Much has been written in recent years about the growing impact of social media on social movements. While authors have extolled the virtues of Facebook and Twitter as organisational and informational tools for a range of movements from the Arab Spring to Occupy, evidence remains patchy as to under what conditions social media is most effective at engaging and mobilising the wider public. Drawing on the work of Tarrow, this article considers the impact of cycle effects on the effectiveness of social media as a mobilising and organising tool for the 2010/11 U.K. student protests. Although preceding the broader ‘movement of the squares’ contention cycle, the protests made similar use of social media for generating mass participation. Yet, its mobilising power was dependent on a number of temporal factors, including amplification through mainstream media and the urgency of its initial campaign goal. Moreover, towards the end of the cycle, activists were found to be using social media – via ‘secret’ Facebook groups – in ways that reinforced emerging group hierarchies, arguably contradicting their initial commitment to open-access networks and participatory democracy.     

The physical activity-mediated Demand–Control (pamDC) model: Linking work characteristics,leisure time physical activity,and well-being

Only recently has research begun to investigate the interplay between work characteristics, leisure time physical activity (LTPA), health, and well-being. So far, however, this research lacks a theoretical foundation. In this article, we introduce the physical activity-mediated Demand–Control (pamDC) model as a new theoretical framework. The two key ideas of the pamDC model are (1) that job demands and job control affect LTPA and (2) that LTPA partially mediates the effects of job demands and job control on health and well-being. We present eight propositions explaining how work characteristics affect LTPA, health, and well-being. For each of these propositions, we discuss empirical evidence and theoretical foundations. We then sketch a research agenda on how to adopt the pamDC model as a new theoretical framework for future research linking work characteristics, LTPA, and health. Finally, we discuss the practical implications of our new model.     

DOES OPTION THEORY HOLD FOR MAJOR LEAGUE BASEBALL CONTRACTS?

We test whether option theory indicated by the Black–Scholes formula is consistent with contract negotiations between teams and players in Major League Baseball (MLB). Teams use contract options in order to obtain the right to buy a player's services for an extra year when negotiating multiple year contracts. These options are similar to European call options, and should reduce the risk of buying volatile assets (players with high variation in performance). In this paper, we model the decision to buy an option (include an option year in the contract) and whether to exercise the option (pay the option salary in the option year versus buying out the option). The results indicate that the behavior of MLB teams is consistent with standard option theory both in terms of buying and exercising options. The sample is the complete population of free agent hitters who signed new contracts between the years 2003 and 2011. We were unable to find any published literature that has addressed this issue. (JEL ZO, H3)     

A Flexible Bayesian Model for Estimating Subnational Mortality

Reliable subnational mortality estimates are essential in the study of health inequalities within a country. One of the difficulties in producing such estimates is the presence of small populations among which the stochastic variation in death counts is relatively high, and thus the underlying mortality levels are unclear. We present a Bayesian hierarchical model to estimate mortality at the subnational level. The model builds on characteristic age patterns in mortality curves, which are constructed using principal components from a set of reference mortality curves. Information on mortality rates are pooled across geographic space and are smoothed over time. Testing of the model shows reasonable estimates and uncertainty levels when it is applied both to simulated data that mimic U.S. counties and to real data for French départements. The model estimates have direct applications to the study of subregional health patterns and disparities.     

The Interaction of Same-Sex Marriage Access With Sexual Minority Identity on Mental Health and Subjective Wellbeing

Previous psychological and public health research has highlighted the impact of legal recognition of same-sex relationships on individual identity and mental health. Using a sample of U.S. sexual minority (N = 313) and heterosexual (N = 214) adults, participants completed a battery of mental health inventories prior to the nationwide legalization of same-sex marriage. Analyses of covariance (ANCOVAs) examining identity revealed sexual minority participants living in states where same-sex marriage was banned experienced significantly higher levels of internalized homonegativity than sexual minority participants living in states where same-sex marriage was legal, even after controlling for state-level political climate. Mental health ANCOVAs revealed sexual minority participants residing in states without same-sex marriage experienced greater anxiety and lower subjective wellbeing compared to sexual minority participants residing in states with same-sex marriage and heterosexual participants residing in states with or without same-sex marriage. Implications for public policy and future research directions are discussed.     

Competing risk analysis in a large cardiovascular clinical trial: An APEX substudy

Competing risk methods are time‐to‐event analyses that account for fatal and/or nonfatal events that may potentially alter or prevent a subject from experiencing the primary endpoint. Competing risk methods may provide a more accurate and less biased estimate of the incidence of an outcome but are rarely applied in cardiology trials. APEX investigated the efficacy of extended‐duration betrixaban versus standard‐duration enoxaparin to prevent a composite of symptomatic deep‐vein thrombosis (proximal or distal), nonfatal pulmonary embolism, or venous thromboembolism (VTE)–related death in acute medically ill patients (n = 7513). The aim of the current analysis was to determine the efficacy of betrixaban vs standard‐duration enoxaparin accounting for non‐VTE–related deaths using the Fine and Gray method for competing risks. The proportion of non‐VTE–related death was similar in both the betrixaban (133, 3.6%) and enoxaparin (136, 3.7%) arms, P = .85. Both the traditional Kaplan‐Meier method and the Fine and Gray method accounting for non‐VTE–related death as a competing risk showed equal reduction of VTE events when comparing betrixaban to enoxaparin (HR/SHR = 0.65, 95% 0.42‐0.99, P = 0.046). Due to the similar proportion of non‐VTE–related deaths in both treatment arms and the use of a univariate model, the Fine and Gray method provided identical results to the traditional Cox model. Using the Fine and Gray method in addition to the traditional Cox proportional hazards method can indicate whether the presence of a competing risk, which is dependent of the outcome, altered the risk estimate.     

Ergodicity and truncation bounds for inhomogeneous birth and death processes with additional transitions from and to origin

ABSTRACT

In this paper, we present the extension of the analysis of time-dependent limiting characteristics the class of continuous-time birth and death processes defined on non-negative integers with special transitions from and to the origin. From the origin transitions can occur to any state. But being in any other state, besides ordinary transitions to neighboring states, a transition to the origin can occur. All possible transition intensities are assumed to be non-random functions of time and may depend on the state of the process. We improve previously known ergodicity and truncation bounds for this class of processes that were known only for the case when transitions from the origin decay exponentially (other intensities must have unique uniform upper bound). We show how the bounds can be obtained if the decay rate is slower than exponential. Numerical results are given in the queueing theory context.