arXiv subjects

Serena Arima

Publications and source records attributed to Serena Arima.

5 recordsLinked to original sources

arXiv2026

Violence Against Women: a pilot study on the perception of Apulian High school students

Violence Against Women (VAW) is a widespread issue deeply rooted in social and cultural structures. Affecting women of all ages and backgrounds, VAW is often underreported due to stigma and victim-blaming. This study explores young people's perceptions of VAW in the Apulia region (Southern Italy), using a local survey inspired by a National framework on gender stereotypes and attitudes towards VAW. The survey gathers insights into youth opinions on gender roles, the acceptability of violence, and awareness of VAW within their communities, aiming to uncover the underlying attitudes that perpetuate this issue. The analysis combines two methodological approaches to examine these data. A network-based approach explores relationships within item responses, allowing for an in-depth look at the direct interactions among youth attitudes. This approach is paired with a psychometric model based on Item Response Theory, specifically the Graded Response Model, which interprets attitudes as manifestations of latent traits, revealing how different factors shape perceptions of VAW. Together, these methods offer a comprehensive analysis of young people's views on VAW, highlighting both individual response patterns and broader cultural trends essential for designing effective interventions. Findings indicate a gradual shift in attitudes toward gender roles; however, traditional views remain prevalent, especially among young males. Socioeconomic factors, such as parents' employment status, also contribute to the persistence of stereotypes, underscoring the need for targeted interventions to address and reduce VAW in youth populations.

stat.AP↗

arXiv2026

Human- vs. AI-generated tests: dimensionality and information accuracy in latent trait evaluation

Artificial Intelligence (AI) and large language models (LLMs) are increasingly used in social and psychological research. Among potential applications, LLMs can be used to generate, customise, or adapt measurement instruments. This study presents a preliminary investigation of AI-generated questionnaires by comparing two ChatGPT-based adaptations of the Body Awareness Questionnaire (BAQ) with the validated human-developed version. The AI instruments were designed with different levels of explicitness in content and instructions on construct facets, and their psychometric properties were assessed using a Bayesian Graded Response Model. Results show that although surface wording between AI and original items was similar, differences emerged in dimensionality and in the distribution of item and test information across latent traits. These findings illustrate the importance of applying statistical measures of accuracy to ensure the validity and interpretability of AI-driven tools.

cs.HC↗

arXiv2024

A robust statistical framework for cyber-vulnerability prioritisation under partial information in threat intelligence

Proactive cyber-risk assessment is gaining momentum due to the wide range of sectors that can benefit from the prevention of cyber-incidents by preserving integrity, confidentiality, and the availability of data. The rising attention to cybersecurity also results from the increasing connectivity of cyber-physical systems, which generates multiple sources of uncertainty about emerging cyber-vulnerabilities. This work introduces a robust statistical framework for quantitative and qualitative reasoning under uncertainty about cyber-vulnerabilities and their prioritisation. Specifically, we take advantage of mid-quantile regression to deal with ordinal risk assessments, and we compare it to current alternatives for cyber-risk ranking and graded responses. For this purpose, we identify a novel accuracy measure suited for rank invariance under partial knowledge of the whole set of existing vulnerabilities. The model is tested on both simulated and real data from selected databases that support the evaluation, exploitation, or response to cyber-vulnerabilities in realistic contexts. Such datasets allow us to compare multiple models and accuracy measures, discussing the implications of partial knowledge about cyber-vulnerabilities on threat intelligence and decision-making in operational scenarios.

stat.ME↗

arXiv2018

A unit-level small area model with misclassified covariates

Small area models are mixed effects regression models that link the small areas and borrow strength from similar domains. When the auxiliary variables used in the models are measured with error, small area estimators that ignore the measurement error may be worse than direct estimators. Alternative small area estimators accounting for measurement error have been proposed in the literature but only for continuous auxiliary variables. Adopting a Bayesian approach, we extend the unit-level model in order to account for measurement error in both continuous and categorical covariates. For the discrete variables we model the misclassification probabilities and estimate them jointly with all the unknown model parameters. We test our model through a simulation study exploring different scenarios. The impact of the proposed model is emphasized through application to data from the Ethiopia Demographic and Health Survey where we focus on the women's malnutrition issue, a dramatic problem in developing countries and an important indicator of the socio-economic progress of a country.

stat.ME↗

arXiv2010

An alternative marginal likelihood estimator for phylogenetic models

Bayesian phylogenetic methods are generating noticeable enthusiasm in the field of molecular systematics. Many phylogenetic models are often at stake and different approaches are used to compare them within a Bayesian framework. The Bayes factor, defined as the ratio of the marginal likelihoods of two competing models, plays a key role in Bayesian model selection. We focus on an alternative estimator of the marginal likelihood whose computation is still a challenging problem. Several computational solutions have been proposed none of which can be considered outperforming the others simultaneously in terms of simplicity of implementation, computational burden and precision of the estimates. Practitioners and researchers, often led by available software, have privileged so far the simplicity of the harmonic mean estimator (HM) and the arithmetic mean estimator (AM). However it is known that the resulting estimates of the Bayesian evidence in favor of one model are biased and often inaccurate up to having an infinite variance so that the reliability of the corresponding conclusions is doubtful. Our new implementation of the generalized harmonic mean (GHM) idea recycles MCMC simulations from the posterior, shares the computational simplicity of the original HM estimator, but, unlike it, overcomes the infinite variance issue. The alternative estimator is applied to simulated phylogenetic data and produces fully satisfactory results outperforming those simple estimators currently provided by most of the publicly available software.

stat.CO↗