Notes
-----
For more details on `kruskal`, see `scipy.stats.kruskal`.

Examples
--------
>>> from scipy.stats.mstats import kruskal

Random samples from three different brands of batteries were tested
to see how long the charge lasted. Results were as follows:

>>> a = [6.3, 5.4, 5.7, 5.2, 5.0]
>>> b = [6.9, 7.0, 6.1, 7.9]
>>> c = [7.2, 6.9, 6.1, 6.5]

Test the hypothesis that the distribution functions for all of the brands'
durations are identical. Use 5% level of significance.

>>> kruskal(a, b, c)
KruskalResult(statistic=7.113812154696133, pvalue=0.028526948491942164)

The null hypothesis is rejected at the 5% level of significance
because the returned p-value is less than the critical value of 5%.

Fr