Converts character SNP genotype to numerical (-1, 0, 1) were 1 is the major allele. Modified by Samuel Fernandes from: Alexander E. Lipka, Feng Tian, Qishan Wang, Jason Peiffer, Meng Li, Peter J. Bradbury, Michael A. Gore, Edward S. Buckler, Zhiwu Zhang GAPIT: genome association and prediction integrated tool, Bioinformatics, Volume 28, Issue 18, 15 September 2012, Pages 2397–2399.
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