Bayesian covariance matrix estimation using a mixture of decomposable graphical models

We present a Bayesian approach to estimating a covariance matrix by using a prior that is a mixture over all decomposable graphs, with the probability of each graph size specified by the user and graphs of equal size assigned equal probability. Most previous approaches assume that all graphs are equally probable. We show empirically that the prior that assigns equal probability over graph sizes outperforms the prior that assigns equal probability over all graphs in more efficiently estimating the covariance matrix. The prior requires knowing the number of decomposable graphs for each graph size and we give a simulation method for estimating these counts. We also present a Markov chain Monte Carlo method for estimating the posterior distribution of the covariance matrix that is much more efficient than current methods. Both the prior and the simulation method to evaluate the prior apply generally to any decomposable graphical model.     

Gender Differences in the Presentation of Observable Risk Indicators of Problem Gambling

In many countries where gambling is legalised, there has been a strong public policy focus on the need for strategies to reduce gambling related harm. These have often included policies requiring staff in gambling venues to identify and/or assist people who might be experiencing gambling-related harm. To facilitate this process, researchers have developed visible behavioural indicators that might be used to profile potentially problematic gambling. Few of these studies have, however, examined whether such indicators or ‘warning signs’ might differ between men and women. In this study, we describe the results of an analysis of data drawn from 1185 fortnightly gamblers that included 338 problem gamblers as classified by the Problem Gambling Severity Index. Indicators of problem gambling were similar between males and females with a few key exceptions. Indicators reflecting emotional distress were more commonly reported by females with gambling problems, whereas problem gambling males were more likely to display aggressive behaviour towards gambling devices and others in the venue. Amongst males, signs of emotional distress as well as attempts to conceal their presence in venues from others most strongly differentiated between problem and non-problem gamblers. Amongst females, signs of anger, a decline in grooming and those attempts to access credit were the most distinguishing indicators. These findings have implications for the refinement of identification policies and practices.     

Mormon Mixed-Orientation Marriages: Variations in Attitudes and Experiences by Sexual Orientation and Current Relationship Status

ABSTRACT

Interest in mixed-orientation marriages has been growing among both scholars and the general public. Members of conservative religions such as Mormonism may be particularly willing to enter a mixed-orientation marriage given the faith's emphasis on heteronormativity. Analyzing survey data from a sample of sexual minorities (n = 160) and heterosexuals (n = 80) who are or have been Mormon and in a mixed-orientation marriage, we explore variations in reasons for marriage, the disclosure experience, and levels of attraction and attitudes toward sex by current relationship status. Previously married sexual-minority individuals report more external pressure and belief their same-sex attraction might change as reasons to marry, as well as less desire for their spouses following disclosure. Currently married sexual-minority partners are less likely to report being counseled to marry, and report feeling more relief, approval, and desire in their relationship following disclosure. Currently married heterosexual spouses are more likely to report spiritual confirmation as a reason to marry, as well as more affection for and greater attraction to spouses, but also report feeling less secure about their attractiveness following disclosure. Previously married heterosexual individuals report the most negative feelings following disclosure, and stronger attitudes about the importance of sharing similar sexual interests, desire, and levels of attraction.     

Understanding the Financial Knowledge Gap: A New Dimension of Inequality in Later Life

ABSTRACT

To understand individuals’ financial behaviors, it is important to understand the financial knowledge gap – the distance between one’s objective and subjective financial knowledge. Overestimating one’s financial knowledge can lead to risky financial behaviors. To date, limited empirical work has examined how financial knowledge gap varies across age groups. We analyze the size and nature of the financial knowledge gap and its variation across age groups. Using nationally representative data, we find robust evidence that older adults overestimate their financial knowledge. Social workers can assess the financial knowledge gap and educate their clients to protect from financial fraud, exploitation, and abuse.     

Restructuring Pay Equity for A Restructured Work Force: Canadian Perspectives

The province of Ontario, Canada, has developed innovative pay and employment equity legislation. The legal challenges over the pay equity legislation have established some important precedents, especially in the area of gender bias and job evaluation schemes. The Employment Equity legislation established important new principles but was repealed only a year after it was passed by a new Conservative government. The government and economic restructuring, however, are rapidly altering both the legislation and the context in which it operates. This paper considers not only the impact of such legislation in the long and short run, but also the possibilities for future legislative intervention in the new political and economic climate. One of the authors has been centrally involved in developing the legislation, in mapping alternatives and in bringing legal challenges under the legislation. The other author has been researching and writing about women’s work for more than twenty years and has served as an expert witness in numerous cases related to the issues of concern here.     

Black Sociology and Phenomenological Sociology*

This paper is a comparative analysis of black sociology and phenomenological sociology and an attempt to show how phenomenology might be used to provide an epistemological foundation for black sociology. Attention is directed toward the writings of black and phenomenological sociologists. Arguments rest on appeals to authorities—quotations from and citations to influential writers. The specific points of comparison are the way the protagonists of the perspectives (1) define their activities, (2) criticize conventional sociology, and (3) investigate social reality. Epistemological issues are examined within a framework of the standard methodological problems of validity and reliability.     

Assessing Multidimensional Approaches to Measure Program Outcomes in Human Service Organizations

VOLUNTAS: International Journal of Voluntary and Nonprofit Organizations - This study explores scholars’ approaches to measure performance in nonprofit human service organizations. While...