Vita e Pensiero
Modelling dynamics and uncertainty in assessment of quality standards for fine particulate matters
digital
Year:
2006
In this paper, we consider the displaced dynamical calibration (DDC) model which is able to calibrate biased readings by using displaced data obtained by reference instruments.
Statistical calibration of psychometric tests
digital
Year:
2006
A calibration procedure is generally performed in order to correctly translate the personal traits observed through a psychometric test into numerical values...
On the problem of the minimal sample size for the ratio estimation: an Empirical Bayes approach
digital
Year:
2006
In many application contexts it may be useful to adopt a measure of pre-cision for the estimation of the proportion π of units belonging to a certain popula-tion having some definite characteristics...
A Generalized multivariate skew-normal distribution with
applications to spatial and regression predictions
digital
Year:
2015
In this paper, a generalization to the multivariate skew-normal distribution of Arnold and Beaver (2002) is proposed. Also several distributional properties of the proposed distribution are explored. The proposed distribution has been used to define a stochastic process called the generalized-skew Gaussian process...
The reordering variates in the decomposition by sources of
inequality indexes
digital
Year:
2015
Keywords: Reordering Variate, Income Inequality, Decomposition by Sources, Point Inequality, Uniform Cograduation
On the distribution of the sum of cograduated discrete
random variables with applications to credit risk analysis
digital
Year:
2015
This paper focuses on the notion of cograduation which was first introduced in 1939 by the Italian statistician Tommaso Salvemini. In few words, a certain number of random variables are cograduated if they are associated with the maximum positive dependence. Here, it is shown how to derive the probability distribution of the sum of cograduated discrete random variables...
The distribution of the absolute value of the ratio
of two correlated normal random variables
digital
Year:
2015
The aim of this paper is to study the distribution of the absolute quotient of two Correlated Normal random variables (r.v.s). This study may have many applications, as often the researcher expects a ratio to be positive or considers the sign of the ratio unimportant...
Assessment of covariance structure in longitudinal analysis
digital
Year:
2015
Linear mixed model with various covariance structures have become increasingly popular in longitudinal data analysis. In this paper estimation of parameters with distinct covariance structures using Maximum Likelihood (ML) and Restricted Maximum Likelihood (REML) methods are considered for evaluation of models using six information criteria, namely AIC, AICC, HQIC, BIC, CAIC and AVIC...
The turn of the screw. Changes in income distribution in Italy
(2002-2010)
digital
Year:
2015
This article uses data from the 2002-2010 waves of Bank of Italy Survey on Households Income and Wealth. It reports data on the evolution of the distribution of income by main households’ income sources and by households’ income rank and on the evolution of concentration indexes by the same characters...
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