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Two × two contingency tables used to show the calculation of the G statistic
| A1 | A0 | Total | |
|---|---|---|---|
| A. Observed frequency (Oi) table | |||
| B1 | a | b | a+b |
| B0 | c | d | c+d |
| Total | a+c | b+d | n |
| B. Expected frequency (Ei) table | |||
| B1 | (a+b)(a+c)/n | (a+b)(b+d)/n | a+b |
| B0 | (c+d)(a+c)/n | (c+d)(b+d)/n | c+d |
| Total | a+c | b+d | n |
| C. Probability of A given B [p(A|B)] table | |||
| B1 | a/(a+b) | b/(a+b) | 1 |
| B0 | c/(c+d) | d/(c+d) | 1 |
