Unit 5 · Categories and non-parametrics

How to run a Mann-Whitney U test in SPSS

Run a Mann-Whitney U test in SPSS, read mean ranks and report U, z and effect size r.

Pro lessonAbout 5 minutes7 practice questions

Mann-Whitney U

The nonparametric version of the independent-samples t-test. It compares the ranks of two groups instead of their means.

Two-Independent-Samples Tests

Variables

Participant ID [id]

Age in years [age]

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Test Variable List:1

Anxiety score [anxiety]

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Grouping Variable:2

job(1 2)

Exact…Options…

Test Type:3

✓Mann-Whitney U

Kolmogorov-Smirnov Z

Moses extreme reactions

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1
Test Variable ListThe outcome, often a skewed score or a rating scale.
2
Grouping VariableDefine Groups works just like the t-test: enter the two codes.
3
Mann-Whitney UTicked by default. Found under Analyze › Nonparametric Tests › Legacy Dialogs › 2 Independent Samples.

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