Wilcoxon Signed-Rank Test Calculator

This calculator performs the Wilcoxon signed-rank test, a non-parametric alternative to the paired t-test. Use this when comparing two related measurements that don't meet normality assumptions.

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When to Use

  • Paired/related samples (same subjects measured twice)
  • Differences are not normally distributed
  • Data is ordinal or continuous with outliers

How It Works

  1. Calculate differences between paired values
  2. Rank the absolute differences (ignore zeros)
  3. Sum ranks for positive and negative differences separately
  4. The smaller sum is the W statistic

Null Hypothesis

H₀: The median difference between pairs is zero

Calculate Wilcoxon Test