Wiki - 2016-05-14

**Table of contents**

1. What is it ?

2. How to use it on EasyMedStat ?

The Kruskal-Wallis test is a replacement for the Mann-Whitney test when comparing more than 2 independent groups of patients

The Kruskal-Wallis H test (named after William Kruskal and W. Allen Wallis), or One-way ANOVA on ranks is a non-parametric method for testing distributions between independent groups of patients. The H0 hypothesis is that

Since it is a non-parametric method, the Kruskal-Wallis test does not assume a normal distribution of the residuals, unlike the analogous one-way ANOVA, and can then be used with small samples.

On EasyMedStat, you can use the Kruskal-Wallis test

- You select a
*Numeric*variable you would like to compare between groups, let's say a functional score (Min = 0, Max = 100), and then you select a*List*variable to create groups of patients, for example "Dominant hand". - You will get 3 groups of patients : "Right-handed", "Left-handed", "Ambidextrous", with a mean "Total Score" for each group.
- A BoxPlot will be displayed and then the Kruskal-Wallis test will be performed, telling you if at least one distribution is different from the others.

NB : If there are only 2 groups to compare (*Yes-no* variables), another test will be done according to pairing and sample size

Wiki

2017-08-20

Most peer-review journals will ask you a "Statistical analysis" chapter in your article (in Material and Methods), in which you can quote EasyMedStat as follows:
"Statistical analysis was performed with the online software EasyMedStat (www.easymed ... Read more

Blog

2017-04-19

To add a patient, click on the "Patients" menu and then choose "+ Add patient" Read more

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