Choosing a Non-Parametric Test

Choosing a Non-Parametric Test is a decision aid to help you determine the most appropriate non-parametric test for your data. Non-parametric tests are useful when the level of measurement is nominal or ordinal or when parametric data do not meet the additional assumptions required for most parametric tests.  The "Non-Parametric" tab on the Statistical Decision Tree Calculator provides an assortment of non-parametric tests, including the one that is best for you!