From: Comparison of three tests of homogeneity of odds ratios in multicenter trials with unequal sample sizes within and among centers
Success
Failure
Total
Treatment 1 (x 1k )
y 1k
n 1k - y 1k
n 1k
Treatment 2 (x 2k )
y 2k
n 2k - y 2k
n 2k
t k
t k - n k
n k