Nonparametric methods

Question 1

The Wilcoxon signed ranks test:

Answer 1

1. Calculates change
2. Changes ranked
3. Zero differences ignored
4. Compare sum of positive ranks to expected under H0

Question 2

Kruskal-Wallis test

Answer 2

1. DV values are ranked from lowest to highest regardless of group
2. Ranks are then allocated to groups
3. Calculate the test statistic