Giancarlo Ragozini

University of Naples Federico II | UNINA · Department of Political Sciences

This study examined the relationships between first-year university students’ academic motivation, retrospective evaluation of school experiences, subjective well-being, engagement and intention to drop out. Self-determination theory, the SInAPSi model of academic engagement, the hedonic approach, and the retrospective judgment process were used to...

Complex network data structures are considered to capture the richness of social phenomena and real-life data settings. Multipartite networks are an example in which various scenarios are represented by different types of relations, actors, or modes. Within this context, the present contribution aims at discussing an analytic strategy for simplifyi...

The phenomenon of internationalization is a priority for higher education institutions. The Erasmus program is the cornerstone of their internationalization strategy, bringing benefits for student recruitment and career outcomes, as well as for staff expertise. Within this scenario, our contribution aims to analyze the performance of European educa...

This work exploits the possibility to combine information retrieved from network analysis and the methodology to construct a performance indicator of the team play in football. The main contribution is to propose a unique index able to summarize the passing behaviour of a football team from a network perspective. The applicability of the proposed a...

The men’s football transfer market represents a complex phenomenon requiring suitable methods for an in-depth study. Network Analysis may be employed to measure the key elements of the transfer market through network indicators, such as degree centrality, hub and authority scores, and betweenness centrality. Furthermore, community detection methods...

Summary statistics of football matches such as final score, possession and percentage of completed passes are not satisfyingly informative about style of play seen on the pitch. In this sense, networks and graphs are able to quantify how teams play differently from each others. We study the distribution of triad census, i.e., the distribution of lo...

In the context of textual analysis, network-based procedures for topic detection are gaining attention as an alternative to classical topic models. Network-based procedures are based on the idea that documents can be represented as word co-occurrence networks, where topics are defined as groups of strongly connected words. Although many works have...

Purpose This study aims to investigate the content of hotel brands’ mission statements (MSs) and their relationship with selected attributes of hotel brands. Design/methodology/approach Content analysis of hotel brands’ MSs was used to detect the MSs’ key words, which were further processed by methods of social network analysis, complemented by cl...

The mobility of university students in Italy has been framed as a phenomenon linked to so-called intellectual migrations and as a subset of the historical and consolidated internal migration path explained in terms of South–North trajectory. This study describes the most important mobility trajectories of students across macro-areas and disciplinar...

Forming an optimal identity is a complex task for young people because it requires distinctive personal resources that are flexible and sensitive to their context. One of these resources, creativity, has been explored in recent psychological literature showing ambiguous relationships with identity development. The present study aims to investigate...

The link between identity and creativity has received attention from developmental psychology only recently, even if these competences are also critical for the formation processes of vocational identity, mainly during late adolescence when young people have to define plans for their professional future. The current study aims at identifying typolo...

In the economics literature, rooted family ties, mainly associated to backward areas, are related to factors disruptive to economic growth.We study the effects of bonding family ties (associated to family-firms) in the entrepreneurial environment of the 19th century South of Italy, to answer some significant questions about its economic delay over...

Il paper realizzato all'interno del lavoro dell'Osservatorio sulla condizione giovanile in Campania, analizza la distribuzione degli Istituti Beneficiari del Programma Scuola Viva in Campania (2015-2020) provando a valutarne l'efficacia rispetto a un indice di rischio dispersione calcolato su base comunale e sub-comunale (Aree di Censimento). Si è...

Il contributo, realizzato all'interno delle attività dell'Osservatorio sulla Condizione Giovanile in Campania, inquadra il programma "Scuola Viva" promosso dalla Regione Campania tra il 2015 e il 2020 all'interno del contesto demografico, sociale, di rapporto con l'istituzione scolastica. Viene analizzata la distribuzione del programma tra Istituti...

In the present contribution we provide a discussion of the paper on “Bayesian graphical models for modern biological applications”. The authors present an extensive review of Bayesian graphical models, which are used for a variety of inferential tasks applied to biology and medicine settings. Our contribution proposes a conceptual connection betwee...

Despite the growing interest on the notion of academic engagement (AE) and its relevance for students’ success, a few valid and reliable instruments on AE have been developed. Moreover, most of the available measures consider AE as a student’s trait rather than a relational and situated dynamic process. This study presents the development and valid...

In this paper, we propose a new joint approach for analyzing affiliation (two-mode) networks by using factorial methods and blockmodeling. In our recent work, we pursued the joint use of a given factorial method, i.e., MCA/MFA, and a clustering method, namely blockmodeling, but through distinct steps. Here we look for a strategy that permits us to...

By applying global standards presented in the ILO Manual to the Italian Aspects of Daily Life (ADL) Survey, the authors analyze volunteer work through the categories of traditional paid work in order to grasp similarities, innovative content, competences, and individual values. The empirical work analyzes the various volunteer occupations by means...

Summary statistics for football matches, such as ball possession and percentage of completed passes, are not always satisfyingly informative about team strategies seen on the pitch. Passing networks and their structural features can be used to evaluate the style of play in terms of passing behavior, analyzing and quantifying interactions among play...

Il presente lavoro si incardina nell'ambito della Summer School "Piano Lauree Scientifiche" (PLS), ponendosi come obiettivo la presentazione e la discussione delle potenzialità dell’analisi di alcune tipologie dati complessi. In particolare, il focus è stato sull'analisi dei dati testuali, settore che ha visto negli ultimi anni un esponenziale svil...

In this article, we study the effect of the Unification on the network power of economic elites in the South of Italy. We study the persistence of economic elites as evidence of the stability of the institutional set up beyond the effect of Unification, and thus as a primary explaining factor of the persistence of social forces slowing and opposing...

The article Crowding out the change: business networks and persisting economic elites in the South of Italy over Unification.

Nonostante il mondo del lavoro abbia subito sostanziali trasformazioni il dominio identita-rio legato alla definizione di sé come lavoratore resta fondamentale (Guichard et al., 2012) e, in tal senso, rimane strettamente legato al benessere personale dell'individuo. Per rispondere in maniera congruente alle nuove sfide del mondo del lavoro, anche l...

The presence of patients affected by different diseases at the same time is becoming a major health and societal issue. In clinical literature, this phenomenon is known as comorbidity, and it can be studied from the administrative databases of general practitioners’ prescriptions based on diagnoses. In this contribution, we propose a two-step strat...

The book includes both invited and contributed chapters dealing with advanced methods and theoretical development for the analysis of social networks and applications in numerous disciplines. Some authors explore new trends related to network measures, multilevel networks and clustering on networks, while other contributions deepen the relationship...

In this paper we explore a new strategy to jointly use factorial methods and blockmodeling to analyse affiliation (two-mode) networks. Among the methods that group simultaneously and directly individuals and variables for binary matrices, we propose using cluster correspondence analysis, in order to (i) look at the way network positions can be inco...

Multiplex networks arise when more than one source of relationships exists for a common set of nodes. Many approaches to deal with this kind of complex network data structure are reported in the literature. In this paper, we propose the use of factorial methods to visually explore the complex structure of multiplex networks. Specifically, the adjac...

In the present contribution, the use of factorial methods for three-way data is proposed to visually explore the structure of multiplex networks, that is, in presence of more relationships measured for a common set of nodes. Specifically, the DISTATIS technique, an extension of multidimensional scaling to three-way data, is used to analyze multiple...

Human knowledge develops through complex relationships between categories. In the era of Big Data, the concept of categorization implies data summarization in a limited number of well-separated groups that must be maximally and internally homogeneous at the same time. This proposal exploits archetypal analysis capabilities by finding a set of extre...

This paper analyses the migration flows of university students from Campania who move to other regions to complete their higher education. The data come from a ministerial student database (Anagrafe M.I.U.R) for the 2006-2007 and 2013-2014 academic years. We first discuss migration from Campania to the rest of Italy to compare other southern region...

State fragility is a concept that entered the political discourse in the last decades producing remarkable implications for aid allocation and international policies. The operationalization of this concept has generated a number of composite indices to produce rankings of fragile states. However, the temporal dimension of the driving forces leading...

Robust location estimators for directional data are known for about 30 years. Scientific literature has focused on studying the asymptotic properties of these estimators like consistency and influence function. Apart from the finite-sample breakdown point, the finite-sample performance of robust directional location estimators has attracted less at...

Computing layer similarities is an important way of characterizing multiplex networks because various static properties and dynamic processes depend on the relationships between layers. We provide a taxonomy and experimental evaluation of approaches to compare layers in multiplex networks. Our taxonomy includes, systematizes and extends existing ap...

The present contribution aims at analyzing the economic relationships that international actors set up around the business opportunities progressively offered by the metropolitan area of Naples over Italian political Unification in order to uncover how and in what hands power was vested. From a unique and original database, data are gathered on the...

The complex phenomena of volunteering was mainly analyzed in economic literature with respect to its "economic value added", i.e the capability of this kind of activities to increase the level of productivity of some specific gods or services. In this paper, the point of view switches and voluntary organizations are analyzed as place of job market...

Purpose: Laparoscopic sleeve gastrectomy (LSG) is one of the most frequently performed bariatric surgery interventions because of its safety and efficacy. Nevertheless, concerns have been raised on its detrimental effect on patient nutritional state that can ultimately lead to the loss of fat-free mass (FFM). There is interest in identifying predi...

The link between identity and creativity has received surprisingly little attention from developmental psychology researchers, although flexibility and the ability to generate multiple solutions to problems are key competences for contemporary society based on continuous innovation and de-standardization of development trajectories. These competenc...

In this study, the theatre industry is conceived of as a field of cultural production, and analysed in the framework of Bourdieu’s field theory and social network analysis (SNA). The theatrical field is formalized as an affiliation network of companies participating in stage co-productions in Italy’s Campania region, over four theatre seasons. Diff...

The purpose of this study was to explore in greater depth the identity formation processes in Italian university students starting from previous studies that have provided support for a “postponed Identity”. Given the particular socio-economic difficulties of the Italian context, especially occupational uncertainty, this study assumes that the year...

The present paper analyses the relationship among social support and personal networks by focusing on social anchorage, which is a specific dimension of social support conveying to what extent people feel integrated into their personal networks. Specifying when, why, and how personal relationships play a significant role in individual lives is a co...

This chapter provides reflections on extrinsic and intrinsic incentive mechanisms, in order to explore the extent to which they are able to motivate users in starting community building processes. The authors present some results of the research project OR.C.HE.S.T.R.A (ORganization of Cultural HEritage for Smart Tourism and Real-time Accessibility...

This chapter provides reflections on extrinsic and intrinsic incentive mechanisms, in order to explore the extent to which they are able to motivate users in starting community building processes. The authors present some results of the research project OR.C. HE.S.T.R. A (ORganization of Cultural HEritage for Smart Tourism and Real-time Accessibili...

Le principali motivazioni e destinazioni delle migrazioni universitarie dei campani Il fenomeno della migrazione intellettuale viene esplorato da un'ampia letteratura che, a partire dagli anni '90, si è sviluppata con una certa evidenza con l'obiettivo di comprendere i meccanismi di formazione e distribuzione del capitale umano all'interno delle di...

Prototypes, as Rosch (1973) defined the term in the cognitive sciences field, are ideal exemplars that summarize and represent groups of objects (or categories) and that are “typical" according to their internal resemblance and external dissimilarity vis-à-vis other groups or categories. In line with the cognitive approach, we propose a data-driven...

In the present study, we discuss how social network analysis approach can be fruitful exploited to study social support within family studies. An ego-centred network approach is adopted within a case study about social support networks of low income single mothers living in a city of southern Italy. We address three main issues. First, we aim to de...

In the present work we propose to analyze, through Multiple Factorial Analysis (MFA), the relational structure embedded in collaboration networks observed across time occasions. We show, through a case study, how the solutions provided by the MFA can be interpreted in a suitable way in the relational setting which arises in complex and heterogeneou...

Establishing a vocational and overall identity involve defining life altering plans and associated commitments to pursue and achieve them and are, therefore, among the most central aspects of the developmental tasks of late adolescents and emerging adults. In the Italian context, young adults' opportunity to develop coherent and fulfilling future p...

In this paper we propose a method to analyze and synthesize a set of N networks that refer to a common scenario and that are comparable among each other. Examples of this type of data are: a set of collaboration networks, each defined for a different scientific field; or a set of ego networks, where egos belong to a same category; a set of governan...

Student exchange program called Erasmus determines a large network of European higher education institutions. As Italy is among the most important stakeholders in Erasmus program, paper analyses student mobility to/from Italian higher education institutions. Aim of the paper is to present preliminary results about the underlying structure of the ne...

Late adolescence and emerging adulthood are periods in the life cycle when individuals are involved in anticipating and planning for the future (futuring). However, in the last five or six years, as the effects of the recession havemade themselves felt in Southern Europe, the situation that young people face has deteriorated dramatically. As a cons...

Among the measures of a distribution’s location, the mode is probably the least often used, although it has some appealing properties. Estimators for the mode of univariate distributions are widely available. However, few contributions can be found for the multivariate case. A consistent direct multivariate mode estimation procedure, called minimum...

In the study of collaborations among theatres, a well-suited way of defining and operationalizing such collaboration is to consider the co-production of theatre plays as an event involving a number of co-producing organizations. This mechanism gives rise to the so-called affiliation network, a type of two-mode network characterized by a set of acto...

Most social networks present complex structures. They can be both multi-modal and multi-relational. In addition, each relationship can be observed across time occasions. Relational data observed in such conditions can be organized into multidimensional arrays and statistical methods from the theory of multiway data analysis may be exploited to reve...

In this paper we propose the use of Multiple Correspondence Analysis to analyze and graphically represent two-mode networks, showing how it can take due account of the nature of the relational data and the intrinsic asymmetry of actors/events networks. We compare the approach based on Multiple Correspondence Analysis with that based on simple Corre...

Factorial techniques are widely used in Social Network Analysis to analyze and visualize networks. When the purpose is to represent the relational similarities, simple correspondence analysis is the most frequent used technique. However, in the case of affiliation networks, its use can be criticized because the involved χ 2 distance does not adequa...

In today's advanced post-capitalist societies, consolidating identity with a view to acquiring adult roles is more complex than in the past. In Italy, the changes in the educational system are also associated with changes in the labor market characterized by lack of opportunity and instability. Therefore, young people on the threshold of university...

Most social networks present complex structures. They can be both multi-modal and multi-relational. In addition, each relationship can be observed across time occasions. Relational data observed in such conditions can be organized into multidimensional arrays and statistical methods from the theory of multiway data analysis may be exploited to reve...

Three-way two mode networks are characterized by a set of n actors and a set of m events in which actors are involved, observed at r different levels (e.g., space or time occasions). They are represented by a three-dimensional relational matrix A=(aijk), where i=1, … , n; j=1,…,m and k=1,…,r. Usually a simultaneous analysis of ways and modes of suc...

Symbolic Data Analysis has represented an important innovation in statistics since its first presentation by E. Diday in the late 1980s. Most of the interest has been for the statistical analysis of Symbolic Data that represent complex data structure where variables can assume more than just a single value. Thus, Symbolic Data allow to describe cla...

Archetypal analysis aims at synthesizing single-valued data sets through a few (not necessarily observed) points that are called archetypes, under the constraint that all points can be represented as a convex combination of the archetypes themselves and that the archetypes are a convex combination of the data. In this paper, we extend this methodol...

Archetypal analysis is a statistical method aiming at synthesizing a set of multivariate observations through few points not necessarily observed. On the other hand, coding data as interval values allows to include variability and variation in the data itself. This work proposes the use of archetypal analysis for interval-coded sensory data to synt...

The Authors studied - in couples of young adult siblings - the hypothesis that gender, gender association in the couple, birth sequence, having or not other siblings, and cohabitation may influence the personal representation of some characteristics of the relationship and of resemblances and differences. 46 couples of siblings (M: 38; F: 54), aged...

In this paper we propose a mixed analytical and graphical exploratory strategy based on data archetypes for the exploratory analysis of multivariate data. Our approach is of considerable help in exploring the periphery of the data scatter, exploiting an outward-inward perspective, to highlight small peripheral groups as well as anomalies, outliers...

Folded binomials arise from binomial distributions when the number of successes is considered equivalent to the number of failures or they are indistinguishable. Formally, if Y~Bin(m,[pi]) is a binomial random variable, then the random variable X=min(Y,m-Y) is folded binomial distributed with parameters m and p=min([pi],1-[pi]). In this work, we pr...

Introduzione Concettualizzato e misurato in una varietà di modi, il costrutto del supporto sociale, per il suo si-gnificato multidimensionale e per la sua complessità, è da alcu-ni autori considerato un meta-costrutto (Prezza e Principato, 2002). In generale è definito come un insieme di " informazioni che in-ducono il soggetto a ritenere di essere...

Benchmarking plays a relevant role in performance analysis, and statistical methods can be fruitfully exploited for its aims. While clustering, regression, and frontier analysis may serve some benchmarking purposes, we propose to consider archetypal analysis as a suitable technique. Archetypes are extreme points that synthesize data and that, in ou...

In Social Network Analysis (SNA), a common approach to analyze two-mode network (affiliation matrix) consists on prior converting it into two one-mode adiacency matrices and examining separately each mode. Alternative methods, like factor analysis and related approaches, have been proposed to simultaneously explore relationships among actors and ev...

This chapter aims to present our data mining vision on Statistical Process Control (SPC) analysis, specifically on the design of multivariate control charts for individual observations in the case of independent data and continuous variables. In order to address new SPC issues such as the presence of multiple outliers and incorrect model assumption...