get individual category: genotyped, dummy, observed
getGDO(id, gID = NULL, DumPrefix = c("F0", "M0"))
character vector with ids, may include NA (as in parent columns in pedigree)
character vector with ids of genotyped individuals
prefix that defines dummy individuals
a factor with length equal to id, and levels Genotyped, Dummy, Observed, None
In contrast to GetDummifiable
, this function only
identifies individuals who currently have a dummy code.