GAGA is a program developed to partition a distance matrix between pairs of objects into K clusters in order to minimize the amount of mean differences within each group (SSD'(WP) statistic).
the Department of Forensic Molecular Biology of the Erasmus MC University Medical Center Rotterdam
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GAGA: a new algorithm for genomic inference of geographic ancestry reveals fine level population substructure in Europeans.
Lao O, Liu F, Wollstein A, Kayser M.
PLoS Comput Biol. 2014 Feb 20;10(2):e1003480. doi: 10.1371/journal.pcbi.1003480.