How does the Mann-Whitney U Test work?

Rank all observations from both groups combined Then: U₁ = n₁n₂ + n₁(n₁+1)/2 − R₁ Then: U = min(U₁, U₂) Then: Compare to critical value table.

Can you give an example of how to use the Mann-Whitney U Test?

Example: Input Group 1: [4,5,6,8,7] · Group 2: [2,3,1,4,3] gives a result of U = 3 → significant difference (n=5 each) (Ranks compared across both groups).

Is the Mann-Whitney U Test free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Mann-Whitney U Test?

Our Mann-Whitney U Test uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Mann-Whitney U Test

📊Mann-Whitney U Test

Group 1 values (comma separated)

Group 2 values (comma separated)

The Mann-Whitney U test is the non-parametric equivalent of the independent t-test. It compares rank sums to test whether two groups have the same distribution, without requiring normality.

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Did You Know?

The Mann-Whitney U statistic divided by n₁×n₂ equals the probability that a random value from group 1 exceeds a random value from group 2.

References

›Mann-Whitney U test — Wikipedia

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