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This procedure is aimed to reduce the dimensionality of a genotypic data. From genotypes data a two-way contingency table is constructed as follow : for each individual a value of 0, 1 or 2 is given to each allele of each locus. 0 if the allele is absent, 1 if present in heterozygous state and 2 if homozygous.Then for each population a pseudo-individu is created by summing allels values of its individuals and appended to the contingency table. This matrix is then provided to the ca() function of the ca Package for computation (only pseud-individus are active this analysis), summaries and visualization in two and three dimensions (Adapted from ca R-package by Nenadic and Greenacre. See http://www.jstatsoft.org/v20/i03/paper for details)

proposed by : Khalid Belkhir

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Based on Pise form generator version: 5.a (18 déc. 2015 12:09)