Aggressive behaviour in adolescence: Links with self‐esteem and parental emotional availability

Aggressive behaviours during adolescence may be predictive of later conduct disorders, hence it is important to early detect their signals and deepen the study of their possible risk factors. In order to address these issues, our study pursued two main objectives: to evaluate the psychometric properties of the Italian adaptation of the Aggression Questionnaire Short‐Form (AQ‐SF), a form never previously used among Italian adolescents; and to investigate the relation among aggressiveness, emotional relationship with both parents and self‐esteem in a sample of adolescents. Our results highlighted that psychometric properties of the Italian AQ‐SF are satisfactory and encourage a wider use of this tool; in addition, we found that self‐esteem plays a mediation role between parental emotional availability and aggression. Prevention efforts should focus on improving the relationship with both parents and strengthening adolescent's self‐esteem.     

Oil and gas depletion: Diffusion models and forecasting under strategic intervention

Crude oil and natural gas depletion may be modelled by a diffusion process based upon a constrained life-cycle. Here we consider the Generalized Bass Model. The choice is motivated by the realistic assumption that there is a self-evident link between oil and gas extraction and the spreading of the modern technologies in wide areas such as transport, heating, cooling, chemistry and hydrocarbon fuels consumption. Such a model may include deterministic or semi-deterministic regulatory interventions. Statistical analysis is based upon nonlinear methodologies and more flexible autoregressive structure of residuals. The technical aim of this paper is to outline the meaningful hierarchy existing among the components of such diffusion models. Statistical effort in residual component analysis may be read as a significant confirmation of a well-founded diffusion process under rare but strong deterministic shocks. Applications of such ideas are proposed with reference to world oil and gas production data and to particular regions such as mainland U.S.A., U.K., Norway and Alaska. The main results give new evidence in time-peaks location and in residual times to depletion.     

A blocked Gibbs sampler for NGG-mixture models via a priori truncation

We define a new class of random probability measures, approximating the well-known normalized generalized gamma (NGG) process. Our new process is defined from the representation of NGG processes as discrete measures where the weights are obtained by normalization of the jumps of Poisson processes and the support consists of independent identically distributed location points, however considering only jumps larger than a threshold \(\varepsilon \). Therefore, the number of jumps of the new process, called \(\varepsilon \)-NGG process, is a.s. finite. A prior distribution for \(\varepsilon \) can be elicited. We assume such a process as the mixing measure in a mixture model for density and cluster estimation, and build an efficient Gibbs sampler scheme to simulate from the posterior. Finally, we discuss applications and performance of the model to two popular datasets, as well as comparison with competitor algorithms, the slice sampler and a posteriori truncation.     

Knowledge Spillovers from FDI: A Critical Review from the International Business Perspective

This paper reviews and organizes the theoretical and empirical research on foreign direct investment (FDI) knowledge spillovers from the international business perspective. In doing so, it develops a framework for the analysis of this phenomenon. The suggested FDI knowledge spillover framework integrates both the macro‐level (country, industry, institutions) and micro‐level (multinational firm, headquarters, subsidiary, local firms) antecedents of spillovers with their consequences, and proposes to analyse spillovers along three main attributes that characterize their occurrence, i.e. their magnitude, scope and speed.     

The Effects of the Tomatis Method on the Artistic Voice

In the theory of the French Ear, Nose and Throat (ENT) doctor Alfred Tomatis, the voice emits the frequencies the ear can perceive. The auditory stimulation, through the treatment elaborated by Tomatis, can determine the stabilization or the improvement of some vocal parameters, as well as the effect on the formants of voice. A group of N = 19 subjects, singers and actors, were assessed by complete clinical ENT evaluations including fibrolaryngoscopy, otoscopy, and clinical audiometry. The voice analysis was carried out with the Multi-Dimensional Voice Program (MDVP) and with the Praat software. The results demonstrate that after the treatment entails an increase in the mean of energy density on the third formant of voice (F3). An improvement in the ability to maintain a constant intensity of the vocal emission resulted from MDVP analysis with a reduction on the standard deviation of the voice amplitude. The improvement in the auditory perception, particularly for 3 kHz, determines a better intelligibility and articulation of the words. The better auditory perception in the zone of 3 kHz reduces the phenomenon of nasalization and gives expressive power to the artistic voice. The decrease of Peak-Amplitude Variation (vAm) lead to a stable voice emission with a better control.     

Joint analysis of occurrence and time to stability after entrance into the Italian labour market: an approach based on a Bayesian cure model with structured stochastic search variable selection

Precarious employment is a serious social problem, especially in those countries, such as Italy, where there are limited benefits from social security. We investigate this phenomenon by analysing the initial part of the career of employees starting with unstable contracts for a panel of Italian workers. Our aim is to estimate the probability of getting a stable job and to detect factors influencing both this probability and the duration of precariousness. To answer these questions, we use an ad hoc mixture cure rate model in a Bayesian framework.     

Globalisation,informalisation and the state in the Indian garment industry

Globalisation has affected the industrial trajectories of developing countries, producing an increasing disarticulation between the management of production and regimes of labour control. While production regimes have been projected into the global arena, labour regimes have remained apparently anchored to regulatory mechanisms provided by local social structures, and gone through increasing processes of informalisation. Examining the case of the Indian garment sector, this paper argues that the informalisation of labour should not be conceived as necessarily taking place ‘in the shadow of the state’. In fact, in the case presented here, the state was a strong active agency behind the process of informalisation, which it supported through formal policies and through its progressive alignment with the interests of capital.     

The Paradox of Children and Life Satisfaction

Empirical analyses of the determinants of life satisfaction routinely include the number of children as one of the socio demographic controls, without explicitly considering that, for a given household income, more children imply a lower level of income per family member. The variable “number of children” then often attracts a negative or insignificant coefficient. Using data from the German Socio Economic Panel 1984–2007 we confirm that the sign of the coefficient for the variable “number of children in the household” is negative when introducing household income without correction for the number of members in a life satisfaction regression. On the contrary, when we equivalise income with the most commonly adopted equivalence scales, so eliminating the monetary cost of raising children, the impact of the variable is positive and significant when a high level of economies of scale is assumed. Our results however lead us to reject slope homogeneity as we find strong differences by gender and region. In particular, the positive effect of children on life satisfaction is stronger for males and East Germans. We interpret these subsample split results as driven by heterogeneous opportunity costs and cultural traits.     

Nature or Nurture? Learning and the Geography of Female Labor Force Participation

One of the most dramatic economic transformations of the past century has been the entry of women into the labor force. While many theories explain why this change took place, we investigate the process of transition itself. We argue that local information transmission generates changes in participation that are geographically heterogeneous, locally correlated, and smooth in the aggregate, just like those observed in our data. In our model, women learn about the effects of maternal employment on children by observing nearby employed women. When few women participate in the labor force, data are scarce and participation rises slowly. As information accumulates in some regions, the effects of maternal employment become less uncertain and more women in that region participate. Learning accelerates, labor force participation rises faster, and regional participation rates diverge. Eventually, information diffuses throughout the economy, beliefs converge to the truth, participation flattens out, and regions become more similar again. To investigate the empirical relevance of our theory, we use a new county‐level data set to compare our calibrated model to the time series and geographic patterns of participation.     

Rudimentary Reading Repertoires via Stimulus Equivalence and Recombination of Minimal Verbal Units

We report a study with sixteen low-SES Brazilian children that sought to establish a repertoire of relations involving dictated words, printed words, and corresponding pictures. Children were taught: (1) in response to dictated words, to select corresponding pictures; (2) in response to syllables presented in both visual and auditory formats, to select words which contained a corresponding syllable in either the first or the last position; (3) in response to dictated-word samples, to “construct” corresponding printed words via arranging their constituent syllabic components; and (4) in response to printed word samples, to construct identical printed words by arranging their syllabic constituents. After training on the first two types of tasks, children were given tests for potentially emergent relations involving printed words and pictures. Almost all exhibited relations consistent with stimulus equivalence. They also displayed emergent naming performances––not only with training words but also with new words that were recombinations of their constituent syllables. The present work was inspired by Sidman''s stimulus equivalence paradigm and by Skinner''s functional analysis of verbal relations, particularly as applied to conceptions of minimal behavioral units and creativity (i.e., behavioral flexibility) in the analytical units applied to verbal relations.