Search results for "Statistica"
showing 10 items of 5969 documents
Disease dispersion as a spatial interaction: The case of Flavescence Dorée
2020
International audience; Flavescence dorée is a serious and incurable vine disease transmitted by an insect vector. Focusing on its spatial diffusion and on its control with pesticides, this paper investigates the private strategies of wine producers and their socially optimal counterparts. The socially optimal regulation has to address two externalities regarding private treatment decisions: (a) the insufficient consideration of collective benefits from controlling the vector populations; (b) the failure to take into account environmental damage related to pesticide application. The probability of infection is estimated on French data from a spatial econometric specification. Three alternat…
A space-time branching process with covariates
2018
The paper proposes a stochastic process that improves the assessment of seismic events in space and time, considering a contagion model (branching process) within a regression-like framework. The proposed approach develops the Forward Likelihood for prediction (FLP) method including covariates in the epidemic component.
Crescita verde e sviluppo sostenibile. Approcci multidimensionali per la valutazione delle regioni italiane
2014
L’obiettivo principale di questa tesi di dottorato è quello di valutare la crescita verde e lo sviluppo sostenibile delle regioni italiane utilizzando un approccio multidimensionale finalizzato alla costruzione di indicatori compositi. L’analisi in componenti principali è utilizzata per sintetizzare le variabili che rappresentano dimensioni della crescita verde e della sostenibilità dello sviluppo. Particolare attenzione è dedicata ai metodi per derivare pesi di ponderazione endogeni, cioè basati sulla struttura dei dati. A differenza dell’analisi sulla crescita verde, dal confronto territoriale sullo sviluppo sostenibile sembra emergere il divario Nord-Sud, che caratterizza in particolare …
A new approach for clustering of effects in quantile regression
2017
In this paper we aim at nding similarities among the coefficients from a multivariate regression. Using a quantile regression coefficients modeling, the effect of each covariate, given a response (also multivariate) is a curve in the multidimensional space of the percentiles. Collecting all the curves, describing the effects of each covariate on each response variable, we could be able to assess if only one or more covariates have same effects on different responses.
Computational Techniques for the Analysis of Small Signals in High-Statistics Neutrino Oscillation Experiments
2020
The current and upcoming generation of Very Large Volume Neutrino Telescopes – collecting unprecedented quantities of neutrino events – can be used to explore subtle effects in oscillation physics, such as (but not restricted to) the neutrino mass ordering. The sensitivity of an experiment to these effects can be estimated from Monte Carlo simulations. With the high number of events that will be collected, there is a trade-off between the computational expense of running such simulations and the inherent statistical uncertainty in the determined values. In such a scenario, it becomes impractical to produce and use adequately-sized sets of simulated events with traditional methods, such as M…
Socio-emotional Problems Experienced by Deaf and Hard of Hearing Students in Ethiopia
2015
This study compares the socio-emotional problems experienced by deaf and hard of hearing (DHH) students with those of hearing students in Ethiopia. The research involved a sample of 103 grade 4 students attending a special school for the deaf, a special class for the deaf and a regular school. Socio-emotional problems were measured using Goodman's self-report measure, the Strengths and Difficulties Questionnaire for children and adolescents. Participants were selected from seven towns in Ethiopia. The results show that, compared to the hearing sample, the DHH students experienced more severe socio-emotional problems across all dimensions, regardless of whether they were in special classes o…
Search for heavy neutrinos with the T2K near detector ND280
2019
This paper reports on the search for heavy neutrinos with masses in the range 140<MN<493 MeV/c2 using the off-axis near detector ND280 of the T2K experiment. These particles can be produced from kaon decays in the standard neutrino beam and then subsequently decay in ND280. The decay modes under consideration are N→ℓ±απ∓ and N→ℓ+αℓ−β(−)ν(α,β=e,μ). A search for such events has been made using the Time Projection Chambers of ND280, where the background has been reduced to less than two events in the current dataset in all channels. No excess has been observed in the signal region. A combined Bayesian statistical approach has been applied to extract upper limits on the mixing elements of heav…
Evaluating the impact of external job mobility on three health outcomes: a longitudinal study of the IDEWE cohort of Belgian workers
2022
There is large debate in the literature about the relationship between job mobility and health. This thesis contributes to this topic by estimating the impact of work mobility on either cardiovascular, musculoskeletal or neuropsychological diseases in a longitudinal study on a sample of Belgian workers followed-up for seven-years. The occurrence of such diseases was assessed through medication use as proxy. In the first part of this thesis, the focus was on CVD and MSD diseases. To this aim, a logistic regression model for autocorrelated data with repeated measures was applied (while controlling for the time-variant and time-invariant confounders). This longitudinal model was adequate to ta…
An analytical review of destination competitiveness´ indicators
2015
The role of indicators in assisting tourism planners and decision-makers in evaluating performances, setting targets and anticipating future scenarios has been widely acknowledged by scholars. The purpose of this study is to provide an evaluation of existing composite indicators of tourism destination competitiveness (TDC) and propose a statistical toolbox/protocol to assess their effectiveness in empirical evaluations. We built the study’s protocol by enriching the OECD technical guidelines to build composite indicators. The protocol contains now 15 criteria used to examine the reviewed indicators, among these two useful quality measures. Ten studies were identified as providing a composit…
Promoting cruise ship as 'tourist destination' on Television: the case of Italy
2019
Destination image is one of the elements that most affect tourists’ decision-making processes (Baloglu and McCleary, 1999). Since a distinctive image can differentiate a destination from its competitors, destinations usually compete also via images (Urry, 1990). In this regard, cruise tourism is no exception, since “image is what sells cruises” (Klein, 2002). Over the past 30 years this has led to significant growth in advertising activities aiming to promote the cruise ship “as the destination in itself” (Wood, 2004). Similar trends can be observed among Italian cruise lines as well. Among different types of promotional texts, the importance of the visual ones in shaping the ways tourist r…