• A new class of Skew-Normal-Cauchy Distribution 

    Arrué, Jaime; Gómez, Héctor W.; Salinas, Hugo S.; Bolfarine, Heleno (Institut d'Estadística de Catalunya, 2015-06)
    Artículo
    Acceso abierto
    In this paper we study a new class of skew-Cauchy distributions inspired on the family extended two-piece skew normal distribution. The new family of distributions encompasses three well known families of distributions, ...
  • An extension of the slash-elliptical distribution 

    Rojas, Mario A.; Bolfarine, Heleno; Gómez, Héctor W. (Institut d'Estadística de Catalunya, 2014-12-04)
    Artículo
    Acceso abierto
    This paper introduces an extension of the slash-elliptical distribution. This new distribution is generated as the quotient between two independent random variables, one from the elliptical family (numerator) and the other ...
  • A note on the likelihood and moments of the skew-normal distribution 

    Martínez, E. H.; Varela, H.; Gómez, H. W.; Bolfarine, Heleno (Institut d'Estadística de Catalunya, 2008)
    Artículo
    Acceso abierto
    In this paper an alternative approach to the one in Henze (1986) is proposed for deriving the odd moments of the skew-normal distribution considered in Azzalini (1985). The approach is based on a Pascal type triangle, which ...
  • Influence diagnostics in exponentiated-Weibull regression models with censored data. 

    Ortega, Edwin M. M.; Cancho, Vicente G.; Bolfarine, Heleno (Institut d'Estadística de Catalunya, 2006)
    Artículo
    Acceso abierto
    Diagnostic methods have been an important tool in regression analysis to detect anomalies, such as departures from the error assumptions and the presence of outliers and influential observations with the fitted models. The ...
  • Likelihood-based inference for the power regression model 

    Martínez-Flórez, Guillermo; Bolfarine, Heleno; Gómez, Héctor W. (Institut d'Estadística de Catalunya, 2015-12)
    Artículo
    Acceso abierto
    In this paper we investigate an extension of the power-normal model, called the alpha-power model and specialize it to linear and nonlinear regression models, with and without correlated errors. Maximum likelihood estimation ...
  • Two alternative estimation procedures for the negative binomial cure rate model with a latent activation scheme 

    Gallardo, Diego I.; Bolfarine, Heleno (Institut d'Estadística de Catalunya, 2016-06-17)
    Artículo
    Acceso abierto
    In this paper two alternative estimation procedures based on the EM algorithm are proposed forthe flexible negative binomial cure rate model with a latent activation scheme. The Weibull modelas well as the log-normal and ...