Asymptotic behavior of RA-estimates in autoregressive 2D processes

In this work we study the asymptotic behavior of a robust class of estimators of the coefficient of a AR-2D process. We establish the precise conditions for the consistency and asymptotic normality of the RA estimator. The AR-2D model has many applications in image modeling and statistical image processing, therefore the relevance of knowing such properties. The adequacy of the AR-2D model is analyzed with real images; we also show the impact of contamination and the capability of the RA estimator to produce useful results even in the presence of spurious data.     

Segregation,informativeness and Lorenz dominance

It is possible to partially order cities according to the informativeness of neighborhoods about their ethnic groups. It is also possible to partially order cities with two ethnic groups according to the Lorenz criterion. We show that a segregation order satisfies four well-established segregation principles if and only if it is consistent with the informativeness criterion. We then use this result to show that for the two-group case, the Lorenz and the informativeness criteria are equivalent.     

Attachment Style,Rules Regarding Sex,and Couple Satisfaction: A Study of Gay Male Couples

This article explores the characteristics of open and closed relationships in 170 gay men according to their levels of satisfaction, their attachment styles, and the rules of having sex outside their relationships for open couples. We found no significant difference between open or closed relationships in levels of satisfaction or attachment styles. However, we found that gay men in open relationships who have explicit rules about having sex with other men are significantly more satisfied that those gay men with no rules. A content analysis of the rules is presented and implications for therapy are drawn from the findings.     

Scoring of web pages and tournaments—axiomatizations

Consider a set of elements which we want to rate using information about their bilateral relationships. For instance sports teams and the outcomes of their games, journals and their mutual citations, web sites and their link structure, or social alternatives and the tournament derived from the voters' preferences. A wide variety of scoring methods have been proposed to deal with this problem. In this paper we axiomatically characterize two of these scoring methods, variants of which are used to rank web pages by their relevance to a query, and academic journals according to their impact. These methods are based on the Perron–Frobenius theorem for non-negative matrices.

Empirical evidence of two-attribute utility dependence on probability

We investigate utility dependence on probability using a new methodology that examines how indifference statements vary with the probability of obtaining times and costs of individual trips. Of 127 subjects, 8 supplied 3 (out of 3) sets of indifference statements consistent with probability independence. Those subjects with 2 or more sets of indifference statements violating probability independence exhibited a systematic dependence, in that knowing the direction of a subject's violation in one set of indifference statements would increase the likelihood of his or her violating other sets of indifference statements in the same direction. Data show that this systematic violation of dependence should not be attributed to artifacts of the experiment.     

The Measurement of Intellectual Influence

This paper examines the problem of measuring intellectual influence based on data on citations between scholarly publications. We follow an axiomatic approach and find that the properties of invariance to reference intensity, weak homogeneity, weak consistency, and invariance to splitting of journals characterize a unique ranking method. This method is different from those regularly used in economics and other social sciences.     

Remittances and labour market outcomes: Evidence from Mexico

The effects of remittances on labour market outcomes have been studied by many researchers, primarily using micro‐level data. While a few studies have also used macro‐level data, they suffer from endogeneity bias due to the inclusion of remittances in their estimations. The present study attempts to fill the gap in the literature by using a set of panel data of Mexican states and by addressing the endogeneity bias with a system GMM (generalized method of moments) estimator. The main conclusions are that remittances increase labour force participation rates and reduce median hours worked, critical employment and unemployment duration.     

Building stronger weak ties among a diverse pool of emergent nonprofit leaders of color

This article explores theoretical underpinnings of social capital and strong and weak ties as they relate to relationships within, between, and among six cohorts of promising nonprofit leaders of color in a northwestern U.S. city. Using mixed methods, including network analyses, it considers the impact and potential of a university‐community collaboration to deliver a program to promising emergent leaders nominated for their talent and commitment to the work of their community‐based organizations, often in competition for limited resources. The article considers the program's implicit effect on relationships and reveals intersector connections among alumni. Findings show substantial alumni movement among organizations, increasing the potential for collaboration and mentoring relationships. We conclude with recommendations for programs seeking long‐term impact and discuss a series of unanticipated findings and the questions they engender, many critical as communities and organizations become more diverse and social needs do not diminish.     

Real men, real husbands: Caregiving and masculinities in later life

Drawing on data from in-depth personal interviews with a sample of fifty-three older men caring for their impaired wives, authors report findings on these men's caregiving experience, specifically on the way they see themselves as men within such role. Through analytic methods based upon content analysis and open coding, authors found that when describing their gendered understanding of themselves participants evidenced several negotiations with the dominant masculine ideology in order to maintain their sense of masculinity and legitimate their presence in a feminine role. This was accomplished by reframing their definition of a man and reinforcing that of a husband and by retaining varying degrees of power over the caregiving relationship. The social visibility of the role within particular gendered community-based social networks was found to be important in shaping these older men's masculinities.