Gamma-Generalized Inverse Gaussian Class of Distributions with Applications

In this article, a new family of probability distributions with domain in ?⁺ is introduced. This class can be considered as a natural extension of the exponential-inverse Gaussian distribution in Bhattacharya and Kumar (1986 Bhattacharya , S. K. , Kumar , S. ( 1986 ). E-IG model in life testing . Calcutta Statist. Assoc. Bull. 35 : 85 – 90 . [Google Scholar]) and Frangos and Karlis (2004 Frangos , N. , Karlis , D. ( 2004 ). Modelling losses using an exponential-inverse Gaussian distribution . Insur. Math. Econo. 35 : 53 – 67 .[Crossref], [Web of Science ®] , [Google Scholar]). This new family is obtained through the mixture of gamma distribution with generalized inverse Gaussian distribution. We also show some important features such as expressions of probability density function, moments, etc. Special attention is paid to the mixture with the inverse Gaussian distribution, as a particular case of the generalized inverse Gaussian distribution. From the exponential-inverse Gaussian distribution two one-parameter family of distributions are obtained to derive risk measures and credibility expressions. The versatility of this family has been proven in numerical examples.     

A discrete distribution including the Poisson

Abstract

This article presents a new generalization of the Poisson distribution, with the parameters α > 0 and θ > 0, using the Marshall and Olkin (1997 Marshall, A.W., Olkin, I. (1997). A new method for adding a parameter to a family of distributions with application to the exponential and Weibull families. Biometrika 84(3):641–652.[Crossref], [Web of Science ®] , [Google Scholar]) scheme and adding a parameter to the classical Poisson distribution. The particular case of α = 1 gives the Poisson distribution. The new distribution is unimodal and has a failure rate that monotonically increases or decreases depending on the value of the parameter α. After reviewing some of the properties of this distribution, we investigated the question of parameter estimation. Expected frequencies were calculated for two data sets, one with an index of dispersion larger than one and the other with an index of dispersion smaller than one. In both cases the distribution provided a very satisfactory fit.     

Effective strategies for socio-educational intervention during the process of transition to adult life of unaccompanied minors from Africa

The arrival of unaccompanied minors from Africa in Spanish territory has been a constant since the last decade of the twentieth century. This migratory phenomenon has forced the child welfare system to attend to thousands of migrant children. The transition to adult life is a decisive stage in overcoming the situation of social exclusion. This research aims to analyse which socio-educational intervention strategies are effective during the process of transition to independent living with unaccompanied minors of African origin. We designed a qualitative research according to the grounded theory, which we divided into two phases. Twenty-nine young people (26 men and 3 women) participated. In phase 1, we performed two focus groups (N = 11), and in phase 2, we conducted longitudinal follow-ups (N = 18) for 24 months through 180 interviews. The results indicate the effectiveness of designing socio-educational accompaniment, prioritizing spaces of trust from which to attain the goals of emancipation. Young people consider effective those strategies that favour their knowledge of the social, labour and legal reality of the host society, designed considering each minor's individualized situation. We concluded that professional involvement acts as a buffer, reducing the bureaucratic obstacles implemented by the Spanish government.     

The relational costs of crossing class lines

How do low socioeconomic status students navigate cross-class interactions in extremely unequal contexts? Previous research has described the high costs of college integration for underprivileged students, which in turn, negatively impact academic performance and general wellbeing. These studies tend to concentrate on cultural capital costs, such as catching up with assumed middle-class or elite capital and dealing with two worlds. Less has been said about social capital costs, the costs of making friends, especially more privileged friends. Through 61 in-depth interviews with various types of students as part of a broader ethnographic fieldwork, this article analyses the experiences of low-income scholarship holders in an elite institution in a very unequal society, Colombia. Rather than isolating themselves or resorting to safe homophilic relations, they faced their new elite environment engaging with the hidden relational cost of making friends with more affluent students. In so doing, they had to overcome fears and experiences of discrimination and micro-aggressions, as well as cultural and economic capital barriers, and employed either camouflaging or disclosure strategies, sometimes becoming culturally and socially omnivorous. Symbolic belonging to the institution and the acquisition of middle-class cultural capital were among the benefits that made overcoming the costs worthy. Our results shed light on what institutions can do to reduce the costs for underprivileged students and, theoretically, unveil an important mechanism and barrier for social mobility: building cross-class ties.     

“I'm going to do battle… I'm going to do some good”. Biographical trajectories,moral politics,and public engagement among highly religious young Catholics in Spain and Mexico

Public debates and controversies on moral issues have gained visibility in recent decades in both Spain and Mexico. Conservative Catholic groups and networks are increasingly playing a crucial role in raising and framing highly morally charged themes in the public arena, especially on intimacy-related policies, including sexual and reproductive freedoms. A new generation of young Catholic leaders becoming key political agents has emerged in this scenario. They are fostering new mobilisation repertoires in the public sphere (e.g., digital activism and public performances) and promoting new political narratives merging moral, cultural, and religious elements. These highly religious and conservative young Catholics consider themselves part of a cultural/cognitive minority and feel entitled to become what Howard Becker termed “moral entrepreneurs.” Most have been educated in Catholic schools and belong to Catholic movements. Still, they can also navigate secular politics and strategically use different regimes of justification and action. Within this context, the article aims to examine and compare the intersection of historical trends and the relevance of individual biographies to understand the role of these young Catholics in the public space in both countries.     

Special issue: Child protection in the digital age. Latent profiles in cyberbullying and the relationship with self-concept and achievement goals in preadolescence

In recent years, the scientific community has taken an interest in cyberbullying research due to the emotional and educational impact on all those involved. However, the scant evidence on samples from primary education is derived from statistical methodologies focusing on the individual, which generate specific profiles rather than acting roles. The present study focuses on the profiles of cyberbullying and its variability with the levels of self-concept and academic goals, using a sample of 548 Spanish primary education students aged 10–13 (M = 10.95, SD = 0.7). After analysing the data using Latent Class Analysis and MANOVA, the profiles developed were ‘not-involved’ (38.82%), ‘moderate victimization’ (37.17%), ‘high bully-victimization’ (19.29%) and ‘low victimization’ (4.7%). In addition, the group of students with the not-involved profile scored higher on the self-concept of their relationship with their parents, in language, in mathematics and their general self-concept than the group with moderate victimization. The same pattern was also observed for learning goals. The findings have significant implications for the creation of person-centred cyberbullying prevention programmes that permit a more targeted approach to cyberbullying behaviours in order to halt its progress.     

New configurations of labour insertion processes. The case of secondary technical and vocational education and training students in Chile

This article presents the results of a longitudinal study that followed a sample of 1011 young people who completed their secondary technical and vocational education and training studies in Chile between 2011 and 2016. It adopts a mixed design that combines both quantitative and qualitative methodological strategies to analyse transitions and post-study trajectories. Analysis has helped to identify the prevalence of non-linear and unstructured transitions to the labour market. It has also shown the existence of education-work links and employment alternatives that are generated in certain sectors as well as identified how these give rise to specific opportunity structures that affect on aspirations and career pathways. Results indicate that graduates of the industrial area of study experience more substantive educational integration and labour links following course completion due to greater levels of alignment between their training and the productive demands of the industrial sectors. However, their experiences over the medium term are fragmented and, thus, reflect those of their peers from other areas.     

The sexual division of labour: A qualitative analysis of social organisations in Peru

This is a study on participation in civil society organisations in Peru, which adopts a gender perspective to understand the dynamics of social welfare production in a family model, and in which there is also a preponderance of community intervention in the field of social protection. The study uses a qualitative methodology and an ethnographic analysis based on 21 organisations. The results indicate polarity of discourses between those who recognise gender differentiation and those who consider that there is gender equality. Despite the polarity, differences in roles, quantity and quality of services, leadership, involvement and motivation are shown. The differences identified vary according to the type of organisation, which shows the relationship between the organisations and the intervention in territories-regions.