public class FriedmanTestextends StatisticalTestThe Friedman's test. This test can be applied to reject as null hypothesis that the n medians of the treatments (columns) are equal when applied to k blocks (rows). Ties are broken by the midrank method (e.g. a tie in ranks 6 and 7 is assumed as a 6.5 rank for both values). Variance of the statistic is adjusted as a consequence of ties A multiple-comparisons procedure (Bonferroni-Dunn), applied at 0.10 and 0.05 levels of significance is also provided.