Friedman Test Calculator
Non-parametric alternative to repeated measures ANOVA. For comparing 3+ related conditions.
When to Use
- Same subjects measured under 3+ conditions
- Non-normal distribution of differences
- Ordinal data or outliers present
How It Works
- Ranks conditions within each subject
- Sum ranks for each condition across subjects
- Calculate Q statistic from rank sums
Null Hypothesis
H₀: All conditions have the same distribution