Analysis of three independent groups using non-parametric kruskal-wallis test in stata software

Abstract

In this paper, we have presented theoretical principles of analysis of three or more independent groups using the Kruskal-Wallis test. We have presented calculations using formulas as well as a step-by-step algorithm for use of this test in STATA software. Moreover, we have given practical examples with special emphasis on assumptions of this test. We have also presented recommendations for presentation of results in scientific publications.