2020: Vol. 44, Núm. 1

Summary

  • Small area estimation of additive parameters under unit-level generalized linear mixed models 

    Hobza, Tomáš; Marhuenda, Yolanda; Morales, Domingo (Institut d'Estadística de Catalunya, 2020-06-26)
    Article
    Open Access
    Average incomes and poverty proportions are additive parameters obtained as averages of a given function of an income variable. As the variable income has an asymmetric distribution, it is not properly modelled via normal ...

  • Finding archetypal patterns for binary questionnaires 

    Cabero, Ismael; Epifanio, Irene (Institut d'Estadística de Catalunya, 2020-06-26)
    Article
    Open Access
    Archetypal analysis is an exploratory tool that explains a set of observations as mixtures of pure (extreme) patterns. If the patterns are actual observations of the sample, we refer to them as archetypoids. For the first ...

  • Integer constraints for enhancing interpretability in linear regression 

    Carrizosa, Emilio; Olivares-Nadal, Alba V.; Ramírez-Cobo, Pepa (Institut d'Estadística de Catalunya, 2020-06-26)
    Article
    Open Access
    One of the main challenges researchers face is to identify the most relevant features in a prediction model. As a consequence, many regularized methods seeking sparsity have flourished. Although sparse, their solutions may ...

  • Modelling count data using the logratio-normal-multinomial distribution 

    Comas Cufí, Marc; Martín-Fernández, Josep Antoni; Mateu-Figueras, Glòria; Palarea-Albaladejo, Javier (Institut d'Estadística de Catalunya, 2020-06-26)
    Article
    Open Access
    The logratio-normal-multinomial distribution is a count data model resulting from compounding a multinomial distribution for the counts with a multivariate logratio-normal distribution for the multinomial event probabilities. ...

  • Bartlett and Bartlett-type corrections for censored data from a Weibull distribution 

    Magalhães, Tiago M.; Gallardo, Diego I. (Institut d'Estadística de Catalunya, 2020-06-26)
    Article
    Open Access
    In this paper, we obtain the Bartlett factor for the likelihood ratio statistic and the Bartlett-type correction factor for the score and gradient test in censored data from a Weibull distribution. The expressions derived ...

  • Green hybrid fleets using electric vehicles: solving the heterogeneous vehicle routing problem with multiple driving ranges and loading capacities 

    Hatami, Sara; Eskandarpour, Majid; Chica, Manuel; Juan, Angel A.; Ouelhadj, Djamila (Institut d'Estadística de Catalunya, 2020-06-26)
    Article
    Open Access
    The introduction of Electric Vehicles (EVs) in modern fleets facilitates green road transportation. However, the driving ranges of EVs are limited by the duration of their batteries, which arise new operational challenges. ...

  • Bayesian structured antedependence model proposals for longitudinal data 

    Castillo-Carreno, Edwin; Cepeda-Cuervo, Edilberto; Núñez-Antón, Vicente (Institut d'Estadística de Catalunya, 2020-06-26)
    Article
    Open Access
    An important problem in Statistics is the study of longitudinal data taking into account the effect of other explanatory variables, such as treatments and time and, simultaneously, the incorporation into the model of the ...

  • On interpretations of tests and effect sizes in regression models with a compositional predictor 

    Coenders, Germà; Pawlowsky-Glahn, Vera (Institut d'Estadística de Catalunya, 2020-06-26)
    Article
    Open Access
    Compositional data analysis is concerned with the relative importance of positive variables, expressed through their log-ratios. The literature has proposed a range of manners to compute log-ratios, some of whose ...