Nonparametric Statistics

Nonparametric Statistics 

Use: When data violates assumptions of parametric tests. Data transformations do not solve problems. Analyses are performed on the ranks of the data (not original or raw data). 

Nonparametric alternatives: 

Mann-Whitney U test: 

Used instead of Two Independent Sample Student’s t-test 

Wilcoxon signed rank: (paired samples or matched pairs) test: 

Used instead of Two Dependent Sample Student’s t test 

Kuruksal- Wallis H test: 

Used instead of ANOVA