Vita e Pensiero
A Comparison of Variable Selection Methods in Competing
Risks Models for Business Failures
digital
Year:
2022
The statistical techniques that are applied to the analysis and prediction of the failure of business enterprises include regression modelling of hazard functions. Because a large number of financial variables are available as potential predictors, it is necessary to choose an appropriate variable selection procedure in this modelling...
Estimating aversion to rank inequality underlying selected italian indices of income inequality
digital
Year:
2022
In this paper, we estimate aversion to rank inequality (ATRI) underlying selected Italian income inequality indices, I, notably the Pietra index, the Bonferroni index and the “new” Zenga index. We measure ATRI by the parameter v of the generalised Gini index G(v). ATRI is distinct from aversion to income inequality, as measured by parameter ε of Atkinson’s index A(ε). We propose eliciting v from the equation I = GE(v)...
Exploring financial microblogs: analysis of users’ trading profiles with multivariate statistical methods
digital
Year:
2022
StockTwits is a Social Media focused on finance that is receiving increasing attention from finance experts and enthusiasts. In this work, StockTwits’ users are studied considering some of their self-declared characteristics, such as trading experience, holding period of the stocks, and trading approach. A Correspondence Analysis is carried out to investigate the relationships among these characteristics, the Simple Correspondence Analysis is applied to study the relationships between the approach and the holding period...
A Data-Driven Approach to Multivariate Monte Carlo Simulation
digital
Year:
2022
We describe a model-free, fully data-driven approach to simulating random draws from a continuous multivariate distribution. The proposed technique is an extension of the smoothed bootstrap which explicitly accounts for local differences in the dispersion of individual data points in the sample. Results from a number of simulation experiments suggest that in many cases, the procedure presented strikes a favourable balance between the conflicting objectives of adequately reflecting key characteristics of the underlying distributions and smoothing out the gaps between the individual data points in the sample...
Application of Nonparametric Stability Methods in Chickpea (Cicer Arietinum L.) Crop Under Diverse Environments
digital
Year:
2022
Apply different nonparametric tests for genotype x environment interactions (GEI) on 27 chickpea genotypes evaluated for Fusarium wilt across 10 environments. Results of nonparametric tests of Bredenkamp and Van der de kroon and parametric test of combined analysis of variance across environments indicated the presence of both crossover and non-crossover interactions of GEI...
Assessing dimensions of the city’s reputation
digital
Year:
2021
In social psychology, reputation has been studied with reference to different objects (individuals, brands, cities, etc.) and methodologically, measured discerning between its subdimensions. In this article, city reputation is operationally defined, by using the validated City Reputation Indicators scale...
Analysis of structural break in VAR (k) time series model: a bayesian approach
digital
Year:
2021
Vector autoregressive (VAR) model is the most popular modeling tool in macroeconomics. This study considers a Bayesian framework for VAR(k) model with a structural break in the mean. The structural change problem in VAR is of theoretical and practical importance in reference to the economic time series data...
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