From: GCORE-sib: An efficient gene-gene interaction tool for genome-wide association studies based on discordant sib pairs
AA
Aa
aa
BB
R 11 − n 11
R 12 − n 12
R 13 − n 13
Bb
R 21 − n 21
R 22 − n 22
R 23 − n 23
bb
R 31 − n 31
R 32 − n 32
R 33 − n 33