Now showing items 1-11 of 11

    • Balances: a new perspective for microbiome analysis 

      Rivera Pinto, J.; Egozcue Rubí, Juan José; Pawlowsky Glahn, Vera; Paredes, Raul; Noguera Julian, Marc; Calle, M. L. (2018-07)
      Article
      Open Access
      High-throughput sequencing technologies have revolutionized microbiome research by allowing the relative quantification of microbiome composition and function in different environments. In this work we focus on the ...
    • Bayes linear spaces 

      Van den Boogaart, Karl Gerald; Egozcue, Juan José; Pawlowsky Glahn, Vera (Institut d'Estadística de Catalunya, 2010)
      Article
      Open Access
      Linear spaces consisting of -finite probability measures and infinite measures (improper priors and likelihood functions) are defined. The commutative group operation, called perturbation, is the updating given by Bayes ...
    • Chronic kidney disease of unknown origin is associated with environmental urbanisation in Belfast, UK 

      McKinley, Jennifer M.; Mueller, Ute; Atkinson, Peter M.; Ofterdinger, Ulrich; Cox, Siobhan F.; Doherty, Rory; Fogarty, Damian; Egozcue Rubí, Juan José; Pawlowsky Glahn, Vera (2021-07)
      Article
      Open Access
      Chronic kidney disease (CKD), a collective term for many causes of progressive renal failure, is increasing worldwide due to ageing, obesity and diabetes. However, these factors cannot explain the many environmental clusters ...
    • Evidence functions: a compositional approach to information 

      Egozcue Rubí, Juan José; Pawlowsky Glahn, Vera (Institut d'Estadística de Catalunya, 2018-07-01)
      Article
      Open Access
      The discrete case of Bayes’ formula is considered the paradigm of information acquisition. Prior and posterior probability functions, as well as likelihood functions, called evidence functions, are compositions following ...
    • Exploration of geochemical data with compositional canonical biplots 

      Graffelman, Jan; Pawlowsky Glahn, Vera; Egozcue Rubí, Juan José; Buccianti, A. (2018-07-25)
      Article
      Open Access
      The study of the relationships between two compositions is of paramount importance in geochemical data analysis. This paper develops a compositional version of canonical correlation analysis, called CoDA-CCO, for this ...
    • Microbiome datasets are compositional: and this is not optional 

      Gloor, Gregory B.; Macklaim, Jean M.; Pawlowsky Glahn, Vera; Egozcue Rubí, Juan José (2017-11)
      Article
      Open Access
      Datasets collected by high-throughput sequencing (HTS) of 16S rRNA gene amplimers, metagenomes or metatranscriptomes are commonplace and being used to study human disease states, ecological differences between sites, and ...
    • Modified Kolmogorov-Smirnov test of goodness of fit 

      Monti, Gianna S.; Mateu Figueras, Gloria; Ortego Martínez, María Isabel; Pawlowsky Glahn, Vera; Egozcue Rubí, Juan José (2017)
      Conference report
      Open Access
      A modified version of the Kolmogorov-Smirnov (KS) test is presented as a tool to assess whether a specified, although arbitrary, probability model is unsuitable to describe the underlying distribution of a set of observations. ...
    • Rethinking the Kolmogorov-Smirnov test of Goodness of fit in a compositional way 

      Monti, Gianna S.; Mateu Figueras, Gloria; Ortego Martínez, María Isabel; Pawlowsky Glahn, Vera; Egozcue Rubí, Juan José (Pearson, 2018)
      Conference report
      Open Access
      The Kolmogorov Smirnov test (KS) is a well known test used to asses how a set of observations is significantly different from the probability model specified under the null hypothesis. The KS test statistic quantifies the ...
    • Some thoughts on counts in sequencing studies 

      Egozcue Rubí, Juan José; Graffelman, Jan; Ortego Martínez, María Isabel; Pawlowsky Glahn, Vera (2020-12-01)
      Article
      Open Access
      Measurements in sequencing studies are mostly based on counts. There is a lack of theoretical developments for the analysis and modelling of this type of data. Some thoughts in this direction are presented, which might ...
    • Survey data on perceptions of contraceptive methods as compositional tables 

      Pawlowsky Glahn, Vera; Egozcue Rubí, Juan José; Planes Pedra, Montserrat (2018-07)
      Article
      Open Access
      This paper studies the relative evaluation of young people and the possible benefits associated with three methods of avoiding sexually transmitted infections/AIDS and/or unwanted pregnancies (condoms, contraceptive pills, ...
    • The normal distribution in some constrained sample spaces 

      Mateu Figueras, Gloria; Pawlowsky Glahn, Vera; Egozcue Rubí, Juan José (2013-01-01)
      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 ...