2015: Vol. 39, Núm. 2

Summary

  • Twenty years of P-splines 

    Eilers, Paul H.C.; Marx, Brian D.; Durbán, Maria (Institut d'Estadística de Catalunya, 2015-12)
    Article
    Open Access
    P-splines first appeared in the limelight twenty years ago. Since then they have become popular in applications and in theoretical work. The combination of a rich B-spline basis and a simple difference penalty lends itself ...

  • Likelihood-based inference for the power regression model 

    Martínez-Flórez, Guillermo; Bolfarine, Heleno; Gómez, Héctor W. (Institut d'Estadística de Catalunya, 2015-12)
    Article
    Open Access
    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 ...

  • On the bivariate Sarmanov distribution and copula. An application on insurance data using truncated marginal distributi 

    Bahraoui, Zuhair; Bolancé, Catalina; Pelican, Elena; Vernic, Raluca (Institut d'Estadística de Catalunya, 2015-12)
    Article
    Open Access
    The Sarmanov family of distributions can provide a good model for bivariate random variables and it is used to model dependency in a multivariate setting with given marginals. In this paper, we focus our attention on the ...

  • On the interpretation of differences between groups for compositional data 

    Martín-Fernández, Josep-Antoni; Daunis-i-Estadella, Josep; Mateu-Figueras, Glòria (Institut d'Estadística de Catalunya, 2015-12)
    Article
    Open Access
    Social polices are designed using information collected in surveys; such as the Catalan TimeUse survey. Accurate comparisons of time use data among population groups are commonlyanalysed using statistical methods. The total ...

  • Robust project management with the tilted beta distribution 

    Hahn, Eugene D.; López Martín, María del Mar (Institut d'Estadística de Catalunya, 2015-12)
    Article
    Open Access
    Recent years have seen an increase in the development of robust approaches for stochastic project management methodologies such as PERT (Program Evaluation and Review Technique). These robust approaches allow for elevated ...

  • A note on "Double bounded Kumaraswamy-power series class of distributions" 

    Pogány, Tibor K.; Nadarajah, Saralees (Institut d'Estadística de Catalunya, 2015-12)
    Article
    Open Access
    In a recent edition of SORT, Bidram and Nekoukhou proposed a novel class of distributions and derived its mathematical properties. Several of the mathematical properties are expressed as single infinite sums or double ...

  • Parameter estimation of Poisson generalized linear mixed models based on three different statistical principles: a simulation study 

    Casals, Martí; Langohr, Klaus; Carrasco, Josep Lluís; Rönnegård, Lars (Institut d'Estadística de Catalunya, 2015-12)
    Article
    Open Access
    Generalized linear mixed models are flexible tools for modeling non-normal data and are usefulfor accommodating overdispersion in Poisson regression models with random effects. Theirmain difficulty resides in the parameter ...

  • Multinomial logistic estimation in dual frame surveys 

    Molina, David; Rueda, Maria del Mar; Arcos, Antonio; Ranalli, Maria Giovanna (Institut d'Estadística de Catalunya, 2015-12)
    Article
    Open Access
    We consider estimation techniques from dual frame surveys in the case of estimation of proportions when the variable of interest has multinomial outcomes. We propose to describe the joint distribution of the class ...