Numeric vector of length 4 with counts of "_", "0", "1", "2" respectively.
Arguments
s
A character vector with elements "_", "0", "1", "2" representing
missing data, homozygots for allele 1, heterozygots, and
homozygots for allele 2. The vector should represent a single individual.
Details
Summarizes the number of markers that are fixed for an allele in the genome of
one individual. This is used to construct the I4 matrix in diem.