Il tuo browser non supporta JavaScript!

Leo Pasquazzi

Libri dell'autore

First applications of a new three-parameter distribution for non-negative variables
Gratis
digital
formato: Articolo | STATISTICA & APPLICAZIONI - 2012 - 2
Anno: 2012
SUMMARY Zenga (2010a) recently proposed a new three-parameter family of density functions for non-negative variables. Its properties resemble those of economic size distributions: it has positive asymmetry, Paretian right tail and it may be zeromodal, unimodal or even bimodal. In this paper we explore some methods for fitting the new density to empirical income distributions. We will see that D’Addario’s invariants method clearly outperforms Pearson’s moments method, which does not seem to work well with heavy tailed distributions. Further, we propose some new methods based on the minimization of a measure for the goodness of fit, imposing restrictions on the parameter space to preserve some features of the empirical distribution in the fitted model. We will see that these methods provide very satisfactory results with income distributions from Italy, Swiss, US and UK. Keywords: Income Distribution, Zenga’s Distribution, Goodness of Fit, Moments Method, Invariants Method.
Scarica
More on M.M. Zenga’s new three-parameter distribution for nonnegative variables
Gratis
digital
formato: Articolo | STATISTICA & APPLICAZIONI - 2011 - 1
Anno: 2011
SUMMARY Recently Zenga (2010) has proposed a new three-parameter density function f (x : µ; α; θ), (µ > 0; α > 0; θ > 0), for non-negative variables. The parameter µ is equal to the expectation of the distribution. The new density has positive asymmetry and Paretian right tail. For θ > 1, Zenga (2010) has obtained the expressions of: the distribution function, the moments, the truncated moments, the mean deviation and Zenga’s (2007a) point inequality A(x) at x = µ. In the present paper, as to the general case θ > 0, the expressions of: the distribution function, the ordinary and truncated moments, the mean deviations and Zenga’s point inequality A (µ) are obtained. These expressions are more complex than those previously obtained for θ > 1 by Zenga (2010). The paper is enriched with many graphs of: the density functions (0.5 ≤ θ ≤ 1.5), the Lorenz L(p) and Zenga’s I (p) curves as well as the hazard and survival functions. Keywords: Non-Negative Variables, Positive Asymmetry, Paretian Right Tail, Beta Function, Lorenz Curve, Zenga’s Inequality Curve, Hazard Function, Survival Function.
Scarica
Minimum sample sizes in asymptotic confidence intervals for Gini’s inequality measure
Gratis
digital
formato: Articolo | STATISTICA & APPLICAZIONI - 2008 - 2
Anno: 2008
Statistical inference for inequality measures has been of considerable interest in recent years. Income studies often deal with very large samples, hence precision would not seem a serious issue. Yet, in many empirical studies large standard errors are observed (Maasoumi, 1997). Therefore, it is important to provide methodologies to assess whether differences in estimates are statistically significant. This paper presents an analysis of the performance of asymptotic confidence intervals for Gini’s index, virtually the most widely used inequality index. To determine minimum sample sizes assuring a given accuracy in confidence intervals, an extensive simulation study has been carried out. A wide set of underlying distributions has been considered, choosing from specific models for income data. As expected, the minimum sample sizes are seriously affected by some population characteristics as tail heaviness and asymmetry. However, in a wide range of cases, it turns out that they are smaller than sample sizes actually used in social sciences.
Scarica
 

News

09.09.2020
Vicini alla scuola: i nostri consigli di lettura
Fino al 30 settembre è attiva sul sito la promozione su tutti i libri della collana di pedagogia ed educazione: un percorso di lettura dedicato agli insegnanti.
14.09.2020
FAUST: uno dei Mostri favolosi
Anteprima del nuovo libro di Alberto Manguel, "Mostri favolosi", una galleria di personaggi vivi e attuali, sebbene di carta e inchiostro, come il dottor Faust.
14.09.2020
Teen immigration al Congressino del Pime
In occasione del 89esimo Congressino Missionario del Pime di Milano, incontro con Anna e Elena Granata, autrici di "Teen Immigration".
11.09.2020
PordenoneLegge 2020: festa del libro con gli autori
Leonardo Becchetti e Joseph Stiglitz sono tra gli ospiti di Pordenone Legge 2020 per due appuntamenti a tema economico il 18 e 19 settembre.

Newsletter

* campi obbligatori

Collane

  • Cultura e storia
  • Filosofia morale
  • Grani di senape
  • Le nuove bussole
  • Metafisica e storia della metafisica
  • Pagine prime
  • Punti
  • Relazioni internazionali e scienza politica.ASERI
  • Sestante
  • Studi interdisciplinari sulla famiglia
  • Temi metafisici e problemi del pensiero antico
  • Transizioni
  • Varia. Saggistica
  • Scopri le altre Collane