This section contains the following items. Details for each can be found by scrolling down the page.
°	Rank Order Correlation
°	Mann-Whitney Test
°	Wilcoxon Signed-Ranks Test
°	Kruskal-Wallis Test
°	Friedman Test

Rank Order Correlation. As the page opens, you will be prompted to enter the number of items for which there are paired rankings. If you are starting out with raw (unranked) data, the necessary rank- ordering will be performed automatically. Mann-Whitney Test. Nonparametric test for the significance of the difference between the distributions of two independent samples, A and B, of sizes n_a and n_b, respectively. As the page opens, you will be prompted to enter the values of n_a and n_b. If the samples are of different sizes, the larger of the two should be designated as sample A. If you are starting out with raw (unranked) data, the necessary rank-ordering will be performed automatically. Wilcoxon Signed-Ranks Test. Nonparametric test for the significance of the difference between the distributions of two non-independent samples involving repeated measures or matched pairs. Beginning with a set of n paired values of X_a and X_b, this unit will perform the necessary rank- ordering along with all other steps appropriate to the Wilcoxon test. As the page opens, you will be prompted to enter the number of paired values of X_a and X_b. Kruskal-Wallis Test. Nonparametric test for the significance of the difference among the distributions of k independent samples, A, B, etc., of sizes n_a, n_b, etc., respectively. As the page opens, you will be prompted to enter the sizes of your several samples. If you are starting out with raw (unranked) data, the necessary rank- ordering will be performed automatically.
  For k = 3       For k = 4        For k = 5   Friedman Test. Nonparametric test for the significance of the difference among the distributions of k correlated samples (A, B, etc., each of size n) involving repeated measures or matched sets. As the page opens, you will be prompted to enter the value of n. The necessary rank- ordering of your raw data will be performed automatically.
  For k = 3       For k = 4