Wilcoxon Signed-Rank Test Calculator
Non-parametric paired comparison test.
W Statistic
23
W-23
Z Approximation-1.2551
W Statistic vs Non-Zero Pairs
公式
## Wilcoxon Signed-Rank Test **W = min(W+, W-)** Rank absolute differences, sum positive and negative ranks separately.
计算示例
12 pairs, W+=55.
- 01W- = 78-55 = 23
- 02W = min(55,23) = 23
常见问题
When vs paired t-test?
When differences are not normal.
Zero differences?
Exclude them, reduce n.
Tied ranks?
Average the tied ranks.
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