Modeling heavy-tailed,skewed and peaked uncertainty phenomena with bounded support

A prevalence of heavy-tailed, peaked and skewed uncertainty phenomena have been cited in literature dealing with economic, physics, and engineering data. This fact has invigorated the search for continuous distributions of this nature. In this paper we shall generalize the two-sided framework presented in Kotz and van Dorp (Beyond beta: other continuous families of distributions with bounded support and applications. World Scientific Press, Singapore, 2004) for the construction of families of distributions with bounded support via a mixture technique utilizing two generating densities instead of one. The family of Elevated Two-Sided Power (ETSP) distributions is studied as an instance of this generalized framework. Through a moment ratio diagram comparison, we demonstrate that the ETSP family allows for a remarkable flexibility when modeling heavy-tailed and peaked, but skewed, uncertainty phenomena. We shall demonstrate its applicability via an illustrative example utilizing 2008 US income data.     

REGULATION AND CONTROL OF SUBJECTIVITY AND PRIVATE LIFE IN THE CONTEXT OF ARMED CONFLICT IN COLOMBIA1

A qualitative study was carried out in four municipalities in four different conflict zones in Colombia. Intrafamilial violence and gender violence are studied through the testimonies of the people interviewed. The impact was analysed in terms of the exercise of control over the civilian population by paramilitaries in relation to subjectivity, the family, social networks and the prevailing moral order. In effect, the strengthening of barriers between traditional gender identities has enabled a de-structuring of traditional masculinity through moral co-optation, the reinforcement of traditional feminine identity and the objectification of the sexuality of young women, at the same time as they are manipulated sexually and emotionally. In general, strong legitimation of the model of the armed fighter as a paradigm of masculinity is found in children. In addition, the de-structuring of the family and its manipulation as a means of influence over civil society is one of the strategies employed for the installation of a regime of terror that fractures social networks. It does this through the erosion of confidence and the legitimation and mystification of the power of an actor whose mediation in inter-family and micro-social conflicts has been legitimated, instrumentalizing and scaling up traditional violence, taking advantage of the power vacuum and moral weaknesses in local culture.     

The minimal overlap rule revisited

This paper provides an analysis of the Minimal Overlap Rule, a solution for bankruptcy problems introduced by O’Neill (1982). We point out that this rule can be understood as a composition of Ibn Ezra’s proposal and the recommendation given by the Constrained Equal Loss Rule. Following an interpretation of bankruptcy problems in terms of TU games, we show that the Minimal Overlap Value is the unique solution for bankruptcy games which satisfies Anonymity and Core Transition Responsiveness.     

Influence diagnostics in the capital asset pricing model under elliptical distributions

In this paper we consider the Capital Asset Pricing Model under Elliptical (symmetric) Distributions. This class of distributions, which contains the normal distribution, t, contaminated normal and power exponential, among others, offers a more flexible framework for modelling asset prices or returns. In order to analyze the sensibility to possible outliers and/or atypical returns of the maximum likelihood estimators, the local influence method was implemented. The results are illustrated by using a set of shares from companies who trade in the Chilean Stock Market. Our main conclusion is that symmetric distributions having heavier tails than those of the normal distribution, especially the t distribution with small degrees of freedom, show a better fit and allow the reduction of the influence of atypical returns in the maximum likelihood estimators.     

Educational responses to immigrant students in Madrid

During the last few years, changes in the Spanish educational system have had a far reaching impact. Several factors have been critical: (1) the progressive decentralization of education by the government, now a responsibility of regional governments; (2) the extension of compulsory education to the age of 16; and finally (3) the increase in the number of immigrant students, which has significantly added to the existing cultural diversity. The enrolment of immigrant students in Spanish schools is a relatively recent phenomenon (starting 15 years ago) when compared with other European countries. Madrid is the region in Spain with the largest number of students. As most of these students were born outside of Spain, we cannot yet speak of a second generation. The research described here investigated how the educational system in Madrid confronted the challenge of an increasing number of immigrant students. The institutional response was the Madrid Regional Government’s Compensatory Education Regional Plan. This encompasses several measures, which are described here. After a critical analysis of educational policies pertaining to immigrant pupils, the paper suggests ways of overcoming a purely compensatory approach. Intercultural education plays a key role is such considerations.     

Stages of Mentoring: An Analysis of an Intervention for Pregnant and Parenting Adolescents

A qualitative analysis of 51 matches between volunteer mentors and pregnant adolescents is discussed in terms of problems that occurred and reasons relating to early termination of the match. In each of three stages of the relationship, different issues related to the behavior and interpersonal process between members of the match created problems. In stage one, the mentors had difficulty establishing the match when there was avoidance, distrust, and testing behavior on the part of the mentee. Fear of intimacy and rejection seemed to underlie these relationship difficulties. In stage two, which encompassed the birth of the adolescent’s child, conflict occurred when mentees’ demands overwhelmed the mentors. In the third stage, difficulties discussing termination or continuation of the relationship led to disengagement and less frequent contact. Recommendations are provided to help mentors and mentees navigate the problems in each of these stages.     

Fundamental references from the Western culture

This article presents theoretical elements concerning the ‘nature versus culture’ confrontation as a particular aspect of the worldwide expansion of Western civilization. Several speculations are made concerning the philosophical foundations which have provided the base for the current political and economic mega-scenarios in the contemporary world. We turn our attention to the articulations of the concept of nature with the processes of mondialization of Western culture and with the history of universal culture. Finally, several considerations are made on the dynamics of economic processes on a world scale and projections on the impact of science and technology in the social and political frames that are taking place in the contemporary world.