Vita e Pensiero
Some properties of the Arctangent Distribution
digital
Year:
2004
In the present paper some characteristics of the Arctangent Distribution are analysed.
La distribuzione binomiale trivariata
digital
Year:
2004
This work generalises binomial bivariate distribution to three characters: the binomial trivariate distribution, which exhibits univariate margins binomial and bivariate margins binomial bivariate, is defined and studied.
Forecasting tick-by-tick price movements
digital
Year:
2004
This paper proposes a new technique aimed to forecasting the price movements in the context of ultra-high frequency data, based on the theory of ACD models.
A partial ordering of dependence
for contingency tables
digital
Year:
2004
We introduce a new partial order according to the strength of dependence within the class of all contingency tables with given margins.
Una generalizzazione della distanza di Cayley per l’analisi dei ranghi
digital
Year:
2004
In this paper we consider the Cayley’s distance for rank data and a generalization that we are going to introduce.
Models for contingency tables specified by linear constraints on two types of odds ratios
digital
Year:
2004
The contribution of this work is the simultaneous constraining of more than one type of odds ratio and the approach to manage the row and the column effect of the dependence relationship between categorical variables.
Kurtosis Diagram for the Log-Dagum Distribution
digital
Year:
2004
The aim of this paper is to study, through the kurtosis diagram proposed by Zenga (1996), the kurtosis of the log-Dagum distribution.
Random variate generation from
Multivariate Exponential Power distribution
digital
Year:
2004
In this paper two procedures for random variate generation for the family of Multivariate Exponential Power (MEP) distributions are developed and then compared. By conveniently expressing MEP distributions in terms of mixture of random variables, a simple and fast procedure based on transformation approach is proposed.
Ricerca di soglie critiche per un test su matrici di confusione
digital
Year:
2004
This paper will discuss misclassification errors induced by human judgement. Facing different classifications coming from different trials, often researchers have to evaluate the goodness of classification proposed.
Alcune considerazioni sull’efficienza degli stimatori rapporto-cum-prodotto
digital
Year:
2004
In order to estimate the unknown mean of a study variable using two auxiliary variables, the efficiency of a modified version of the ratio-cum-product estimators is analysed when the sampling fraction is less then 0.5.
L’incidenza dei fattori ambientali sul rischio di malattia: un modello anisotropico
digital
Year:
2004
In this paper we focus on a particular model with directional effects to analyse the health risk around a point source.In order to evaluate the adequacy of the proposed model we perform a Monte Carlo simulation study. In particular we analyse the maximum likelihood estimators properties of the model parameters.
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