If my dependent variable is a technique scored as 1 for correct step and zero for incorrect can I use Friedmans test to compare technique scores at 3 time points?

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#### Best Answer

When the repeated-measures or related-samples data are dichotomous Friedman nonparametric test degenerates into Cochran's Q test (Friedman's chi-square statistic becomes identical to Cochran's Q statistic) which is the extension of McNemar's test from 2 to several related samples. McNemar's uses exact binomial computation of p-value, while Cochran relies on normal approximation, although exact p is available too, via permutations approach.