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**McNemar’s test** is used to test whether or not counts are consistent across two groups. It is often used to test if the counts between a treatment group and control group are equal.

Given the following 2×2 table:

The test statistic X^{2} is computed as (|b-c|-1)^{2} / (b+c) and follows a chi-square distribution with one degree of freedom.

To perform McNemar’s test for a given dataset, simply enter the values in the cells below and then press the “Calculate” button.

Test 2 | |||

Positive | Negative | ||

Test 1 | Positive | ||

Negative |