Variable selection in proportional hazards cure model with time-varying covariates,application to US bank failures*

From a survival analysis perspective, bank failure data are often characterized by small default rates and heavy censoring. This empirical evidence can be explained by the existence of a subpopulation of banks likely immune from bankruptcy. In this regard, we use a mixture cure model to separate the factors with an influence on the susceptibility to default from the ones affecting the survival time of susceptible banks. In this paper, we extend a semi-parametric proportional hazards cure model to time-varying covariates and we propose a variable selection technique based on its penalized likelihood. By means of a simulation study, we show how this technique performs reasonably well. Finally, we illustrate an application to commercial bank failures in the United States over the period 2006–2016.     

Nonparametric semi-supervised classification with application to signal detection in high energy physics

Statistical Methods & Applications - Model-independent searches in particle physics aim at completing our knowledge of the universe by looking for new possible particles not predicted by the...     

A bivariate geometric distribution allowing for positive or negative correlation

In this paper, we propose a new bivariate geometric model, derived by linking two univariate geometric distributions through a specific copula function, allowing for positive and negative correlations. Some properties of this joint distribution are presented and discussed, with particular reference to attainable correlations, conditional distributions, reliability concepts, and parameter estimation. A Monte Carlo simulation study empirically evaluates and compares the performance of the proposed estimators in terms of bias and standard error. Finally, in order to demonstrate its usefulness, the model is applied to a real data set.     

When friendship is stronger than prejudice. Role of intergroup friendships among adolescents in two distinct socio-cultural contexts of immigration

Despite the structural characteristics of international migration in most European countries, the persistence of prejudice and negative attitudes towards immigrants represents an unsolved problem that erodes social cohesion. European institutions continue to be concerned about the spread of xenophobia, especially among young generations. This article aims to shed light on the crucial role of intergroup friendships, considered a key factor in reducing the hostility toward immigrant groups. In particular, the aim is to verify the effects of intergroup friendships on prejudice, using data derived from an international survey carried out in France and Italy, two emblematic European countries as regarding the experience of international migration. 1,642 French and Italian adolescents, selected by a rationale choice sample, were involved: multivariate analysis confirmed the hypothesis that adolescents who hold intergroup friendships show lower levels of prejudice. The influence of the intergroup friendships on the decrease of intolerance is evident especially on socioeconomic and security issues while for the identity matters its effects are moderated by the country of residence of the participants. Considering these results, positive contacts among local and immigrant populations are recommended in order to reduce social fragmentation and foster social cohesion.     

A method for work modeling at complex systems: towards applying information systems in family health care units

Work in organizations requires a minimum level of consensus on the understanding of the practices performed. To adopt technological devices to support the activities in environments where work is complex, characterized by the interdependence among a large number of variables, understanding about how work is done not only takes an even greater importance, but also becomes a more difficult task. Therefore, this study aims to present a method for modeling of work in complex systems, which allows improving the knowledge about the way activities are performed where these activities do not simply happen by performing procedures. Uniting techniques of Cognitive Task Analysis with the concept of Work Process, this work seeks to provide a method capable of providing a detailed and accurate vision of how people perform their tasks, in order to apply information systems for supporting work in organizations.     

A Psychosocial Measure of Social Added Value in Non-profit and Voluntary Organizations: Findings from a Study in the South of Italy

Inspired by the relational framework (Bassi, in: Franz, Hochgerner, Howaldt (eds) Challenge social innovation, Springer, Berlin, pp 325–350, 2012; Donati in Ital J Sociol Educ 5(1):19–35, 2013) and designed to integrate psychological and sociological aspects, a measure of social added value (SAV) was developed and validated. A study was conducted in the South of Italy on a sample of non-profit and voluntary organization members (N?=?394) to examine the statistical validity and psychometric properties of the SAV scale. Confirmatory factor analyses showed that a third-order factor model, saturated by two second-order variables (internal and external relational goods) and eight first-order variables (sense of organizational community, quality of internal relations, influence, social responsibility towards members of the organization, users and stakeholders, organizational identification, and quality of external relations) obtained good satisfactory fit indexes. Additional analyses revealed that shared member values were positively associated with SAV and that there were differences among organizations according to their legal forms and the organizational roles available. Theoretical, methodological, and practical implications of the findings are discussed.     

Beyond black and white: the role of media in portraying and policing migration and asylum in Italy

This paper investigates the media’s role in shaping perceptions and policies concerning the so-called migrant crisis as well as how this affects solidarity with newcomers, specifically focusing on Italy. The first part of the paper examines the coexistence of the humanitarian narratives of saving lives and the spectacle of militarised borders. It unveils how the daily transmission of sensationalist and stereotyped images of migrants contributes to their transforming into subjects and objects of fear, both experiencing the fear of being rejected and eliminated and inspiring fear in the resident populations. The second part addresses the need for innovative approaches in the construction of a positive public image of migrants and refugees. Through an analysis of several communication campaigns, realised by state and non-state actors for the promotion of social coexistence between citizens and newcomers, this paper calls for a fundamental shift in the way we communicate about migration. A concluding reflection on the challenges and opportunities posed by the arrival of migrants and asylum seekers in our societies, proposes that they should not only be perceived as objects of policies, but should be considered active partners of their own inclusion in the receiving societies.     

Objectified conformity: working self-objectification increases conforming behavior*

The present work explores whether self-objectification triggered by doing peculiar work activities would increase people’s conforming behavior. We conducted an experimental study in which participants (N = 140) were asked to perform a high objectifying activity (vs. low objectifying activity vs. baseline condition) simulating a real computer job. Afterwards, their levels of self-objectification and conforming behavior were assessed. Results revealed that participants who performed the high objectifying activity self-objectified (i.e., perceived themselves as lacking human mental states) more than the other conditions and, in turn, conformed more to the judgments of unknown similar others. Crucially, increased self-objectification mediated the effects of the high objectifying activity on enhancing conforming behavior. Theoretical and applied implications of these findings are discussed.     

Self-enforcing family rules,marriage and the (non)neutrality of public intervention

We demonstrate that the notion of a family ‘constitution’ (self-enforcing, renegotiation-proof norm) requiring adults to provide attention for their elderly parents carries over from a world where identical individuals reproduce asexually, to one where individuals differentiated by sex and preferences marry, have children and bargain over the allocation of domestic resources. In this heterogenous world, couples are sorted by their preferences. If a couple’s common preferences satisfy a certain condition, the couple have an interest in instilling those preferences into their children. Policies are generally nonneutral. In particular, wage redistribution may raise, and compulsory education will reduce, the share of the adult population that is governed by family constitutions, and thus the share of the elderly population who receive attention from their children.