'case': case-control status (1=Case, 0=Control)
'geno': a matrix of alleles indicating genotype where each locus
has a pair of adjacent columns of alleles, and the order of columns
corresponds to the order of the loci on the chromosome (1=A, 2=C,
3=T, 4=G)
'gender': gender (1=Male, 2=Female)
'age': age in years
'race': race (1=White, 2=Black, 3=Asian, 4=Other)