example.geno: a data frame with minor allele count for subjects (rows)
at variant positions (columns); example.ped: pedigree and trait data for subjects in
example.geno; example.map: gene and chromosome for variant positions in example.geno
example.geno -data frame with minor allele count for 20 variant
positions:
ped
{pedigree ID, character or numeric}
person{person ID, used with ped to match subjects to
their row in example.ped}
AA.1-AA.10,AX.1-AX.10{genotype columns at 10 positions for
each of 2 simulated genes}