Search results for "NETWORK"
showing 10 items of 7718 documents
Statistically Validated Networks for assessing topic quality in LDA models
2022
Probabilistic topic models have become one of the most widespread machine learning technique for textual analysis purpose. In this framework, Latent Dirichlet Allocation (LDA) (Blei et al., 2003) gained more and more popularity as a text modelling technique. The idea is that documents are represented as random mixtures over latent topics, where a distribution overwords characterizes each topic. Unfortunately, topic models do not guarantee the interpretability of their outputs. The topics learned from the model may be only characterized by a set of irrelevant or unchained words, being useless for the interpretation. Although many topic-quality metrics were proposed (Newman et al., 2009; Alet…
Statistically Validated Networks for evaluating coherence in topic models
2022
Probabilistic topic models have become one of the most widespread machine learning technique for textual analysis purpose. In this framework, Latent Dirichlet Allocation (LDA) gained more and more popularity as a text modelling technique. The idea is that documents are represented as random mixtures over latent topics, where a distribution over words characterizes each topic. Unfortunately, topic models do not guarantee the interpretability of their outputs. The topics learned from the model may be characterized by a set of irrelevant or unchained words, being useless for the interpretation. In the framework of topic quality evaluation, the pairwise semantic cohesion among the top-N most pr…
MEASURING TOPIC COHERENCE THROUGH STATISTICALLY VALIDATED NETWORKS
2020
Topic models arise from the need of understanding and exploring large text document collections and predicting their underlying structure. Latent Dirichlet Allocation (LDA) (Blei et al., 2003) has quickly become one of the most popular text modelling techniques. The idea is that documents are represented as random mixtures over latent topics, where a distribution over words characterizes each topic. Unfortunately, topic models give no guaranty on the interpretability of their outputs. The topics learned from texts may be characterized by a set of irrelevant or unchained words. Therefore, topic models require validation of the coherence of estimated topics. However, the automatic evaluation …
Principled Governance: Politics to the People
2022
An influential narrative claims that the erosion of the modern nation state is causing a historical shift from «government» to «governance». Society-centred new modes of governance are displacing state-centric tools of government. Shaped by bottom-up pressures, these changes are in the process of engendering a more democratic and functionally differentiated type of agency – the Networked Polity. The paper challenges this narrative. It claims that extant governance networks are merely means for co-opting specific societal actors. For, the societal actors operating within those networks are given much reduced powers than the ones conceded to them in the past by declining neo-corporate arrange…
Social Network Analysis. Approcci, tecniche e nuove applicazioni
2011
STRANIERI, MERIDIONALI O PROVINCIALI? I CONSUMI NEL TEMPO LIBERO DELLE SECONDE GENERAZIONI
2022
In this paper, we analyze consumption patterns of leisure time among young people belonging to the so-called “second generation” of immigrants in Italy. Leisure time consumption describes how young immigrants use cultural products and services. We analyze data collected by the ISTAT through the survey on the “second generations” (2015). A comparison of leisure consumption patterns between second-generation immigrants and their Italian peers does not show significant differences. Rather, differences in consumption styles are associated to gender (male/female), geographic area of residence (North/South), and size of the municipality (large municipality/small municipality) of residence.
Il problema sociologico dell’altruismo: inquadramento teorico e sviluppi metodologici
2011
Profili istituzionali e pratiche in rete: il caso studio dei profili social della Regione Siciliana
2021
La diffusione dei social media, e l’impiego sempre più consistente da parte delle amministrazioni pubbliche (PA), ha messo in risalto alcune questioni relative alle dinamiche comunicative tra PA, cittadini e sistema dei media, imperniate su pochi ed essenziali concetti cardine, ossia la responsabilità, l’efficienza, la partecipazione, l’ascolto e la qualità. Negli ultimi anni tra le esigenze delle PA si è fatta avanti la necessità di essere presenti sui social e quindi di creare e alimentare dei profili social dedicati. La maggior parte delle regioni italiane è dotata di strutture di comunicazione (dipartimenti appositi, agenzie, società controllate o esterne) ed è presente sui principali s…
American Horror Story e i suoi fan italiani: interazioni e costruzione del discorso on-line
2020
A partire dal concetto sociologico di “audience performativa”, che contraddistingue alcune forme della spettatorialità televisiva contemporanea, in questo contributo prendo in considerazione l’attività di produzione dei fan; in particolare, la produttività testuale e discorsiva, che è spesso riferita alle serie TV. Discuto, poi, il posto dell’horror nella narrazione seriale, traendo spunto da American Horror Story, la serie di successo ideata, nel 2011, da Ryan Murphy e Brad Falchuk. Quindi, attraverso una ricerca empirica di tipo quali-quantitativo, provo a descrivere e spiegare le modalità d’interazione e i discorsi dei fan italiani, iscritti ad una pagina Facebook dedicata alla serie, fa…
Riflessività, interazione e rispetto delle norme. Il contributo dei mixed methods tra analisi dei testi e social network analysis
2018
The book, through a special methodological mix that uses text analysis and social network analysis, explores the ways in which people, starting from some elements considered implicit, are able to problematize specific behaviours. People contribute differently to social change or reproduction, by selecting certain aspects of reality and attributing to these aspects power of constraint or facilitation. Starting from the theoretical approach of Margaret Archer, which looks at the reflexivity of social actors as the capacity to develop an internal conversation, which is able to mediate between structure and agency, the book deals with the dynamics that take place when reflexive types converse o…