Coupling random inputs for parameter estimation in complex models

Complex stochastic models, such as individual-based models, are becoming increasingly popular. However this complexity can often mean that the likelihood is intractable. Performing parameter estimation on the model can then be difficult. One way of doing this when the complex model is relatively quick to simulate from is approximate Bayesian computation (ABC). Rejection-ABC algorithm is not always efficient so numerous other algorithms have been proposed. One such method is ABC with Markov chain Monte Carlo (ABC–MCMC). Unfortunately for some models this method does not perform well and some alternatives have been proposed including the fsMCMC algorithm (Neal and Huang, in: Scand J Stat 42:378–396, 2015) that explores the random inputs space as well unknown model parameters. In this paper we extend the fsMCMC algorithm and take advantage of the joint parameter and random input space in order to get better mixing of the Markov Chain. We also introduce a Gibbs step that conditions on the current accepted model and allows the parameters to move as well as the random inputs conditional on this accepted model. We show empirically that this improves the efficiency of the ABC–MCMC algorithm on a queuing model and an individual-based model of the group-living bird, the woodhoopoe.     

Confronting Misrepresentative Political Messages: The Klan’s 19th- and Early 20th-Century Manifestations

Over the last couple of years, White nationalist groups have been at the forefront of American political life, especially with the events in Charlottesville, Virginia. The historical roots of White nationalist movements run deep in the United States and are most closely associated with the Ku Klux Klan (KKK). In this article the authors explore the history of the KKK outside of the South and how this oft-neglected history gets at elements of intergenerational and intragenerational occlusion. Next, we discuss the type of angry political rhetoric used by the KKK. Finally, a series of activities are provided. These activities enable students to see the presence of the KKK outside of the South, break down elements of intragenerational and intergenerational occlusion as it relates to the Klan, and confront angry political rhetoric in the racist messages of the KKK. These activities give students experience to analyze the messages of White nationalist movements to prepare them as future citizens to counter such rhetoric on the local, state, and national level.     

Professional and Pathological Gamblers: Similarities and Differences

Although much recent research has focused on the gambling practices and psychosocial functioning of pathological gamblers, few investigations have examined the characteristics of professional gamblers. The current project sought to address this gap in the literature by conducting a quantitative comparison of professional and pathological gamblers. Pathological gamblers were recruited and balanced with professional gamblers on demographic variables and preferred gambling activity. A total of 22 professional gamblers and 13 pathological gamblers completed an extensive self-report battery including instruments assessing demographics, gambling behaviors and problems, other psychiatric disorders, current psychosocial functioning, recent stressful events, personality characteristics, and intelligence. Pathological and professional gamblers reported similar rates of gambling frequency and intensity and types of games played. Pathological gamblers endorsed poor psychosocial functioning, whereas professional gamblers reported a rate of psychiatric distress within a normative range. Pathological gamblers also reported lower gambling self-efficacy, greater impulsivity, and more past-year DSM-IV Axis I disorders than professional gamblers. The results of the present study shed light on the unique circumstances of professional gamblers, as well as underscore important differences between such individuals and pathological gamblers that could prove fruitful in future research and intervention and prevention efforts.     

Toward a culturally sensitive child sexual abuse prevention program for latinos

A culturally sensitive sexual abuse prevention program for Latinos is proposed which makes recommendations regarding style of interaction, discussion topics of importance, and other areas which need he considered in the design and implementation of such a program. The role of the child, parents, professionals, and others involved is discussed.     

Unraveling the Politics of Super-rich Mobility: A Study of Crew and Guest on Board Luxury Yachts

Abstract

In this paper, I introduce the superyacht as a unique vessel, as a home and workplace to professional crew and holiday space for its super-rich passengers. Drawing upon the notions of motive, rhythm, and friction from Cresswell’s mobility constellation, this paper illustrates how the politics of super-rich mobility are performed by crew and guests on board. Rather than preserve the perception that super-rich individuals are hyper-mobile I in turn suggest that in the case of the superyacht the desire and to perform their mobility status when on board ultimately circumscribes or restricts super-rich mobility. Using data from an in-depth ethnographic study on board various superyachts, I suggest ways in which the mobility of the yacht can inform both super-rich and shipped mobilities as both fields continue to grow.     

Health Outcomes in Individuals with Problem and Pathological Gambling: An Analysis of the 2014 North Carolina Behavioral Risk Factor Survey System (BRFSS)

Problem and pathological gambling refers to subclinical and clinical levels of maladaptive gambling, respectively, and is associated with specific sociodemographic characteristics as well as a number of poor health outcomes. We examined such demographic, physical health, mental health, and health-related behaviors in a sample of 7045 low-risk gamblers and 244 problem/pathological gamblers. Participants completed the 2014 North Carolina Behavioral Risk Factor Surveillance System telephone survey. Using the National Opinion Research Center’s Diagnostic Screen for Gambling Disorders-CLiP, participants were categorized as either “problem/pathological gamblers” or “low-risk gamblers.” Problem/pathological gamblers were younger, more likely to be male, of ethnic minority status, unmarried, and of lower education than low-risk gamblers. No physical health variables differentiated the groups but problem/pathological gamblers reported experiencing significantly more adverse childhood experiences and engaging in significantly more tobacco and alcohol use compared to low-risk gamblers. Moreover, gender moderated relationships between gambling group and several of the alcohol use variables such that male problem/pathological gamblers exhibited greater alcohol use behavior than male low-risk gamblers but no such relationship was present in females. Overall, this study expands the current knowledgebase on disordered gambling and highlights the need to assess disordered gambling in public health samples. Clinical implications are discussed.