test is a distribution free (nonparametric)
alternative to ANOVA.
It compares several samples and tests
H0 the samples are all drawn
from populations that have equal means
H1 the mean of at least one
of the populations is different
The test involves:
- sort the combined results into size
order and allocate ranks
- form a table that contains the ranks,
instead of the values
- calculate the test statistic 'K using
||sum of the ranks in row 'i'
|| number of values in row 'i'
|| number of rows
||total number of values
'K' has an approximately χ 2
distribution with degrees of freedom
I - 1