## Friedman Test

Friedman test is used to test the difference between treatments across multiple test subjects. Friedman Test is a non-parametric alternative to the parametric Two-Way ANOVA.

## Formula:

`$F_R =\dfrac{12}{nk(k+1)}\sum_{j=1}^k R_{\cdot j}^2-3n(k+1)$`

where

- $k$ is the number of treatments
- $n$ is the number of blocks
- $R_{\cdot j}$ is the sum of the ranks for $j^{th}$ treatment

## Related Resources

Suggestions and comments will be appreciated.