Representation of Species Composition

  • V. Pawlowsky-Glahn
  • T. Monreal-Pawlowsky
  • J. J. Egozcue
Conference paper
Part of the Springer Proceedings in Mathematics & Statistics book series (PROMS, volume 187)


The Aitchison geometry of the simplex, the sample space of compositional data, allows statistical modelling and analysis of compositions without the problems derived from spurious correlation. Here, it is used to show that it offers an alternative to the de Finetti ternary diagram for representing variability of species composition avoiding the problems typical of a standard analysis of proportions, namely spurious correlation and limitation to three or at most four components. The method is illustrated with data representing the species composition of Free and FAD tuna school sets sampled in the Indian and Atlantic Oceans during the 2002–2008 period by purse seiners.


Simplex Ternary diagram Aitchison geometry Tuna Fisheries 


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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • V. Pawlowsky-Glahn
    • 1
  • T. Monreal-Pawlowsky
    • 2
  • J. J. Egozcue
    • 3
  1. 1.Department of Computer Science, Applied Mathematics, and StatisticsUniversity of GironaGironaSpain
  2. 2.IZVGKeighleyUK
  3. 3.Department of Civil and Environmental EngineeringTechnical University of CataloniaBarcelonaSpain

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