Search results for "Statistica sociale"

A pre-processing and network analysis of GPS tracking data

2020

Global Positioning System (GPS) devices afford the opportunity to collect accurate data on unit movements from temporal and spatial perspectives. With a special focus on GPS technology in travel surveys, this paper proposes: (1) two algorithms for the pre-processing of GPS data in order to deal with outlier identification and missing data imputation; (2) a clustering approach to recover the main points of interest from GPS trajectories; and (3) a weighted-directed network, which incorporates the most relevant characteristics of the GPS trajectories at an aggregate level. A simulation study shows the goodness-of-fit of the imputation data algorithm and the robustness of the clustering algori…

Border surveys and Time Location Sampling (TLS): an application on incoming tourism in Sicily

2012

The increasing need of reliable and detailed information at a regional and subregional level poses some challenges related with the measurement of tourists flows, for tourism destination management, planning and promotion purposes,. The aim of this work is twofold; first, it intends to analyse and discuss the main features and limits of the official border surveys conducted in the majority of world’s countries, within the framework of Time Location Sampling (TLS) design; second, it suggests the implementation of TLS design at a subnational level, by presenting the sampling design of the survey on incoming tourists in Sicily, carried out between 2009-2010, aimed at estimating the unobserved …

A flexible approach for modelling a proportion response variable: Loss given default

2016

Loss given default (LGD) is a proportion of a credit exposure that is lost if the obligor defaults on a loan. Response variable LGD contains values between 0 and 1 including both 0 and 1, where 0 means that the balance is fully recovered while 1 means total loss of exposure at default. This article addresses two alternative semi parametric approaches for modelling loss given default, which is measured on the interval [0,1]. The class of models are very flexible and can accommodate skewness and bimodal characteristics of LGD data. The dependence of the predictors of each of the parameters (of the proposed model distribution for LGD) on explanatory variables can be additive P-splines, regress…

Further considerations on a new indicator for higher education student performance

2016

Il presente lavoro si inserisce nel dibattito internazionale sul sistema di voto universitario e sulla sua sintesi come misura della performance di uno studente. Partendo dalla nuova misura proposta in Adelfio et al. (2014), in questo breve articolo si pone l’enfasi sull’importanza della scelta della misura opportuna, soprattutto nella individuazione delle possibili determinanti della performance, utile nella scelte delle opportune politiche di intervento sulla performance della carriera dello studente. Per richiamare il nuovo indicatore proposto e per fare il confronto con quello esistente, si `e fatto riferimento ai Sistema Universitario italiano. This paper joins the international debate…

Tourism expenditure and tourism intra-destination mobility

2022

A general framework for collecting and analysing the tracking data of cruise passengers at the destination

2016

Cruise passengers’ behaviour at the destination is a rather poorly investigated phenomenon. The single exit/entry point and the relatively brief visiting time, which characterize cruise passengers’ experience at their destinations, make the use of GPS technology particularly suitable for the analysis of such a relevant phenomenon. The aim of this research is to propose a general framework for collecting and analysing GPS tracking data relating to cruise passengers’ behaviour at their destination. The main prerequisites and research stages for the implementation of surveys on cruise passengers will be described and a set of tools and measures for the analysis of GPS tracking data will be pro…

SOLUZIONI OPERATIVE ED ASPETTI QUALITATIVI PER LA GEOCODIFICA DI POPOLAZIONI IN AMBITO SANITARIO.

2015

IntroduzioneL'utilizzo dei Geographic Information Systems (GIS) in ambito sanitario, continua a ricevere grande attenzione. La disponibilità di informazioni sulla localizzazione degli individui, consente di effettuare associazioni territoriali sulle cause delle patologie, nonché di indagare aspetti legati alla distribuzione dei servizi sanitari ed all'equità di accesso alle cure. ObiettiviAnalizzare le principali problematiche e le soluzioni operative per la geocodifica di popolazioni e proporre un indice di qualità della geocodifica di cui poter tenere conto in sede di analisi. MetodiCome caso studio vengono illustrate le fasi che hanno portato alla georeferenziazione di indirizzi residenz…

HIV Prevalence in some African Territories: Socio-Economic Drivers

2022

In 2020, 35% of all HIV-positive people in the world lived in Eastern and Southern Africa. This work aims at assessing the relationship between socio-economic drivers and HIV prevalence at the sub-national level in these countries. The data used are drawn from the Demographic and Health Survey, in which a subset of respondents is tested for HIV. Using a fractional logistic regression model on clusters of individuals, middle-to-high wealth is positively associated with higher HIV prevalence, while a higher average number of children acts as a protective factor; moreover, higher proportions of people who have never been in sexual relationships lower their cluster’s HIV prevalence but HIV-posi…

DIETA GLUTEN-FREE (DGF) IN SOGGETTI CELIACI E QUALITA' DELLA VITA

2015

IntroduzioneLa celiachia è una malattia sistemica autoimmune innescata dall’ingestione di glutine in individui geneticamente predisposti. Nell’adulto le presentazioni atipiche con sintomi extraintestinali e gastrointestinali aspecifici sono sempre più comuni. In particolare, la celiachia può indurre cambiamenti psicologici nell’individuo affetto, influenzando principalmente la percezione del benessere. Una dieta rigorosamente priva di glutine (DGF) da seguire per tutta la vita rappresenta l’unica terapia disponibile. Tuttavia, il rispetto rigoroso di una DGF può potenzialmente influenzare la qualità di vita del celiaco e, d’altra parte, l’ atteggiamento e le aspettative del paziente hanno u…

Key indicators and information systems for the evaluation and planning of birthing hospital services

2016

The evaluation, monitoring and management of hospital of birth services requires the availability of a set of information and tools able to orient decision making process, in order to ensure an adequate level of quality of services provided. Given the complexity of birth-related services, a set of indicators related with the multiple dimensions of healthcare quality are required; these include: volume of activity, complexity of birth, territorial distribution and residents-hospital distance, infrastructures, and inter-hospital transfers. The present Paper proposes an integrated system of indicators for the promotion and improvement of birth-related services in the Sicily region, which takes…