Mann Whitney U Test Rank Calculator

Introduction & Importance

The Mann-Whitney U test is a statistical test used to compare two independent samples. It’s particularly useful when the data is not normally distributed. Our calculator helps you determine the rank sums and perform the test easily.

How to Use This Calculator

1. Enter the sample sizes for both groups.
2. Click ‘Calculate’.
3. View the results and chart below.

Formula & Methodology

The Mann-Whitney U test involves calculating the rank sums (U1 and U2) for each sample and comparing them. The formula for U is:

U = n1*n2 + (n1*(n1+1))/2 – R1

Real-World Examples

Data & Statistics

Example Data for Mann-Whitney U Test

Group	Sample Size	Sum of Ranks
Control	10	55
Treatment	12	78

Expert Tips

• Always check the assumptions of the test before using it.
• Consider the effect size, not just the p-value, when interpreting results.

Interactive FAQ

What are the assumptions of the Mann-Whitney U test?

The test assumes that the samples are independent, and that the data is at least ordinal.

Learn more about the Mann-Whitney U test

Try another Mann-Whitney U test calculator