# Friedman test

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The **Friedman test** is a non-parametric statistical test developed by the U.S. economist Milton Friedman. The procedure involves ranking each row (or *block*) together, then considering the values of ranks by columns.

## MethodEdit

- Given data , that is, a tableau with rows (the
*blocks*), columns (the*treatments*) and a single observation at the intersection of each block and treatment, calculate the ranks*within*each block. Replace the data with a new tableau where the entry is the rank of within block . - Find the values:
- ,

- The test statistic is given by .
- Finally, the p-value is given by .