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Observed data for two binary outcome random variables. Here n11 is the number of subjects for whom both variable 1 and variable 2 take on the values 1. n10 is the number where variable 2 is 1 and variable 1 is 0, and n01 and n00 are defined similarly. The total number of observations is N = n11 + n10 + n01 + n00. The row and column marginals are N1+ = n11 + n10, N0+ = n01 + n00, N+1 = n11 + n01 and N+0 = n10 + n00.
| Variable 1 | ||||
|---|---|---|---|---|
| 1 | 0 | |||
| Variable 2 | 1 | n11 | n10 | N1+ |
| 0 | n01 | n00 | N0+ | |
| N+1 | N+0 | N | ||
