Now showing items 1-4 of 4

    • Log-ratio methods in mixture models for compositional data sets 

      Comas Cufí, Marc; Martín-Fernández, Josep Antoni; Mateu-Figueras, Glòria (Institut d'Estadística de Catalunya, 2016-12-19)
      Article
      Open Access
      When traditional methods are applied to compositional data misleading and incoherent results could be obtained. Finite mixtures of multivariate distributions are becoming increasingly important nowadays. In this paper, ...
    • 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. ...
    • 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 ...
    • The normal distribution in some constrained sample spaces 

      Mateu-Figueras, Glòria; Pawlowsky-Glahn, Vera; Juan José, Egozcue (Institut d'Estadística de Catalunya, 2013)
      Article
      Open Access
      Phenomena with a constrained sample space appear frequently in practice. This is the case, for example, with strictly positive data, or with compositional data, such as percentages or proportions. If the natural measure ...