kruskalwallis
              Perform a Kruskal-Wallis test, the non-parametric alternative of a one-way analysis of variance (ANOVA), for comparing the means of two or more groups of data under the null hypothesis that the groups are drawn from the same population, i.e. the group means are equal.
kruskalwallis can take up to three input arguments:
kruskalwallis can return up to three output arguments:
If kruskalwallis is called without any output arguments, then it prints the results in a one-way ANOVA table to the standard output. It is also printed when displayopt is ’on’.
Examples:
| x = meshgrid (1:6); x = x + normrnd (0, 1, 6, 6); [p, atab] = kruskalwallis(x); | 
|  x = ones (50, 4) .* [-2, 0, 1, 5];
 x = x + normrnd (0, 2, 50, 4);
 group = {"A", "B", "C", "D"};
 kruskalwallis (x, group);
  | 
Source Code: kruskalwallis
| 
 x = meshgrid (1:6);
 x = x + normrnd (0, 1, 6, 6);
 kruskalwallis (x, [], 'off');
              Kruskal-Wallis ANOVA Table
Source        SS      df      MS      Chi-sq  Prob>Chi-sq
---------------------------------------------------------
Columns    3139.67     5     627.93    28.29  3.20103e-05
Error       745.33    30      24.84
Total      3885.00    35
                     | 
| 
 x = meshgrid (1:6);
 x = x + normrnd (0, 1, 6, 6);
 [p, atab] = kruskalwallis(x);
              Kruskal-Wallis ANOVA Table
Source        SS      df      MS      Chi-sq  Prob>Chi-sq
---------------------------------------------------------
Columns    3232.33     5     646.47    29.12  2.19627e-05
Error       652.67    30      21.76
Total      3885.00    35
                     | 
 
                  | 
 x = ones (30, 4) .* [-2, 0, 1, 5];
 x = x + normrnd (0, 2, 30, 4);
 group = {"A", "B", "C", "D"};
 kruskalwallis (x, group);
              Kruskal-Wallis ANOVA Table
Source        SS      df      MS      Chi-sq  Prob>Chi-sq
---------------------------------------------------------
Columns   93937.00     3   31312.33    77.63  1.11022e-16
Error     50053.00   116     431.49
Total    143990.00   119
                     | 
