Nonparametric calculator

Mann-Whitney U calculator

Compare two independent groups with a rank-based Mann-Whitney U test, including U, z, p-value, rank-biserial effect size, and Cliff’s delta.

Run this test in StatLab Use @statlab/core

When to use it

Use when a two-group comparison should be based on ranks rather than mean differences.

Inputs

  • Group A numeric or ordinal values
  • Group B numeric or ordinal values
  • Tie handling
  • Alternative hypothesis

Reporting cautions

  • The test compares distributions, not only medians.
  • Large tie blocks deserve explicit reporting.

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