# Friedman Test for Correlated Samples

From Q

This is a non-parametric version of the Repeated Measures ANOVA. The test statistic is:

where:

- is the number of observations in group of groups,
- is the rank of the th observation from group where the ranking is computed within observations (e.g., if then ), where 1 is assigned to the lowest value and the average rank is used for ties,
- is the number of matched samples,
- is the Calibrated Weight,
- ,
- ,