McNemar's Test Calculator

Analyze paired nominal data to test for marginal homogeneity using McNemar's chi-square test.

2x2 Contingency Table

a (Both Positive)

b (Before+, After-)

c (Before-, After+)

d (Both Negative)

Significance Level (alpha)

McNemar Chi-Square (Corrected)

4.0500

Statistically Significant

pP-Value

0.131994

cvCritical Value

3.841

OROdds Ratio

0.3333

b+cDiscordant Pairs

20

Results

Chi-Square (uncorrected): 5.0000
95% CI for OR: [0.1211, 0.9172]
Total Sample Size: 50

Formula

Chi-Square = (|b - c| - 1)^2 / (b + c)