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McNemar's Q
Explanations > Social Research > Analysis > McNemar's Q
Description | Calculation | Discussion | See also
Description
This test is used when there is dichotomous data (two-state, eg. yes/no) in table format. It is used to test for correlation.
A typical arrangement is for multiple questions being asked of multiple people.
Provided N (the number of individuals) is larger than 30, the statistic follows the Chi-square distribution and the Chi Square table can be used.
Calculation
Q is calculated as:
Q = ((C-1)*(SUM(T2) - (SUM(T))2) / (C*SUM(X) - SUM(X2))
...where T is the total for each column, X is the total for each row, and C is the number of questions.
Discussion
This is a variant on the chi-square test to cope with situations where variables can only have one of two values.
See also
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