On the estimation of extreme directional multivariate quantiles

Abstract

In multivariate extreme value theory (MEVT), the focus is on analysis outside of the observable sampling zone, which implies that the region of interest is associated to high risk levels. This work provides tools to include directional notions into the MEVT, giving the opportunity to characterize the recently introduced directional multivariate quantiles (DMQ) at high levels. Then, an out-sample estimation method for these quantiles is given. A bootstrap procedure carries out the estimation of the tuning parameter in this multivariate framework and helps with the estimation of the DMQ. Asymptotic normality for the proposed estimator is provided and the methodology is illustrated with simulated data-sets. Finally, a real-life application to a financial case is also performed.     

Health related quality of life of women at the sixth week and sixth month postpartum by mode of birth

Background

Health-related quality of life of women in the postpartum period may depend on the mode of birth. However, previous findings are contradictory.

Equalising opportunities in health through educational policy

Despite the growing prominence of theoretical analysis of inequality of opportunity over the past twenty years, empirical work towards the normative evaluation of real-world policies has been minimal. This paper seeks to address this issue. It proposes a normative framework to model the influence of educational policy on health outcomes, grounded in Roemer’s model of equality of opportunity. We apply this model to the National Child Development Study cohort, who, since their schooling lay within the transition period of the comprehensive education reform in England and Wales, attended different types of secondary school. We use this reform in two ways: first, to evaluate the health outcomes of different educational policies under different normative principles; second, to simulate counterfactual distributions of health outcomes by neutralising the different channels through which early life circumstances influence health. Evidence on the comparative performance of the two educational systems is mixed, suggesting that the opportunity-enhancing effects of the comprehensive reform were, at best, modest in terms of adult health. For some of the health outcomes considered, this leads to a convergence between the policy recommendations made by the two ethical principles of equality of opportunity and utilitarianism, while for others, the two principles diverge in their evaluation.     

Peer Influence on Prosocial Behavior in Adolescence

Adolescence is a time of increased sensitivity to peer influence, which creates vulnerabilities but also opportunities. In this study, we examined the influence of peers on prosocial behavior in 12‐ to 16‐year‐old adolescents (N = 197). We utilized a public goods game in which participants made decisions about the allocation of coins between themselves and the group. Participants received manipulated peer feedback on a subset of decisions. Results indicate a significant interaction between feedback condition (prosocial, antisocial, or no feedback) and allocation choices: Prosocial behavior increased after prosocial feedback and decreased after antisocial feedback. These findings support the idea that peer influence creates not only vulnerabilities, but also opportunities for healthy prosocial development and social adjustment learning.     

Spanish version of the Generalized Sense of Power Scale / Versión española de la Escala de Sensación de Poder General

In this paper we present the development of the Spanish version of the Generalized Sense of Power Scale — individuals’ perception about their ability to influence others. After examining evidence of content validity, in two studies we investigated the psychometric properties of the Generalized Sense of Power Scale (GSPS) and its relationship with other theoretically related variables. In Study 1, we found through an exploratory factor analysis that the factorial structure of the GSPS presents two differentiated factors: sense of soft power and sense of harsh power. In Study 2, a confirmatory factor analysis replicated this finding, and we also found the expected correlations between these two factors and other theoretically related variables. Furthermore, we found that these two factors showed adequate internal consistency in both studies. All in all, our results suggest that the Spanish version of the GSPS is an instrument that is able to measure the generalized sense of power.     

Size matters: vegetation patch size and surface temperature relationship in foothills cities of northwestern Argentina

Urbanization is one of the most extreme forms of land alteration. Energy fluxes are severely affected and cities tend to have the Urban Heat Island (UHI) phenomenon, although vegetated areas inside cities could have a positive effect in mitigating UHI effect. Our main objective was to analyze the relationship between vegetation characteristics, patch size and land surface temperature (LST) in three urban areas of northwestern Argentina. We selected 38 green spaces of different size distributed in four cities, all located in the eastern foothills of the subtropical mountain forests. We used Landsat TM satellite images to calculate Normalized Difference Vegetation Index (NDVI) and LST. We assessed the net effect of patch size on LST by computing a Difference Temperature Index. At the regional scale, our results showed that vegetation patch size had a direct effect on reducing the LST of the green space. At a local scale, the analysis of the relationship between vegetation on urban green spaces and LST along a gradient of urbanization showed that green spaces with more vegetation tends to reduce LST. The results showed that largest green spaces were between 1.5 and 2.8 °C cooler than the surrounding built. In order to mitigate the UHI effect in cities, larger green spaces appear to be a possible solution.     

Spatial variability of fish communities in a highly urbanised reef system

Urban Ecosystems - Rapid coastal development has generated interest in the ecology of human-modified marine environments. Coastal defence structures such as breakwaters and seawalls are...     

Developmental Changes and Individual Differences in Trust and Reciprocity in Adolescence

A Trust Game was used to examine trust and reciprocity development in 12–18‐year‐old‐adolescents (N = 496), as findings have been conflicting and transitions in adolescence remain elusive. Furthermore, this study tested the roles of gender, risk, and individual differences in empathy, impulsivity, and antisocial tendencies in trust and reciprocity. Results indicate stability in trust and a decrease in reciprocity across adolescence, but also show that trust and reciprocity choices were influenced by risk, and that empathy mediated the age‐related decrease in reciprocity. Males trusted more than females, but there were no gender differences in reciprocity. These findings highlight the importance of considering individual differences and adolescents’ sensitivities to varying contexts in explaining trust and reciprocity development in adolescence.     

Les conditions de travail dans le secteur tourné vers l'exportation du nord du Maroc: du cadre juridique à l'expérience vécue

Les entreprises exportatrices de produits manufacturés et de services implantées dans le nord du Maroc se caractérisent par une grande flexibilité, une main‐d'?uvre sous pression, étroitement encadrée, et la remise en question de certains droits au travail. Les auteurs examinent cette situation à partir du modèle théorique de l'«économie mondiale localisée», en tenant compte du type de l'entreprise, de la branche d'activité et de la catégorie professionnelle. Ils montrent que la réforme du marché du travail de 2004, qui visait à rendre la réglementation marocaine conforme aux conventions internationales, a eu pour effet de renforcer encore la position des sociétés transnationales.     

Spanish version of the Objectified Body Consciousness Scale (OBCS): results from two samples of female university students / Versión española de la Objectified Body Consciousness Scale (OBCS): resultados correspondientes a dos muestras de estudiantes universitarias

Self-objectification happens when people internalize a view of themselves as an object or collection of body parts. Two studies were conducted to validate the Spanish version of the Objectified Body Consciousness Scale (OBCS). This scale assesses self-objectification through three components: body surveillance, body shame and appearance control beliefs in women. In Study 1 and Study 2, 218 and 201 female undergraduate students, respectively, responded to the Spanish version of this scale and other related measures. In Study 2, they also reported on their emotions after being exposed to an objectifying scenario. The three subscales of the Spanish version of the OBCS showed acceptable indices of internal consistency (ranging between α = .68 to .84), and the confirmatory factor analysis showed a three-factor solution to be the most appropriate. Adequate convergent validity was found with respect to the Self-Objectification Questionnaire (SOQ) and other variables such as self-esteem, other-directedness, hostile sexism and enjoyment of sexualization. These findings suggest that the Spanish version of the OBCS is a satisfactory measure of college women’s self-objectification.