CoDa in three-way arrays and relative sample spaces


Abstract


The object of these short notes is to give a set of convenient symbols to define the sample space for the different compositional vectors that can be arranged into a three-way array. For the exploratory analysis of three-way data, Parafac/Candecomp and Tucker3 are some of the most applied models for low-rank decomposition of three-way arrays. Here, in addition to the relative geometry, is presented a concise overview as to how the elements of a three-way array can be transformed into compositional form and the relative geometry is given.


DOI Code: 10.1285/i20705948v5n3p400

Keywords: Simplex space, pertubation operation, powering, compositional data, three-mode analysis

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