The Friedman Test, also known as the two-way analysis of variance by ranks, is a non-parametric statistical test. It is used for comparing three or more non-related groups or treatments in a statistical study. It is a powerful test that assesses whether there are significant differences among the groups based on ranks. Depending on the context, it may be referred to as the Aligned Ranks Test, Conover's Ranks Test, or Refined Friedman Test. The test has several synonyms, including Kruskal-Wallis H Test, Wilcoxon Test, Rank Sum Test, and Mann-Whitney Test. Regardless of the name used, the Friedman Test is widely used in various fields, including social sciences, medicine, and finance.