kruskal.test(x, g)
x
| a numeric vector of data values, or a list of numeric data vectors. |
g
|
a vector or factor object giving the group for the
corresponding elements of x. Ignored if x is a list.
|
kruskal.test performs a Kruskal-Wallis rank sum test of the
null that the location parameters of the distribution of x are
the same in each group (sample). The alternative is that they differ
in at least one.
If x is a list, its elements are taken as the samples to be
compared, and hence have to be numeric data vectors. In this case,
g is ignored, and one can simply use kruskal.test(x) to
perform the test. If the samples are not yet contained in a list, use
kruskal.test(list(x, ...)).
Otherwise, x must be a numeric data vector, and g must
be a vector or factor object of the same length as x giving the
group for the corresponding elements of x.
"htest" containing the following components:
statistic
| the Kruskal-Wallis rank sum statistic. |
parameter
| the degrees of freedom of the approximate chi-square distribution of the test statistic. |
p.value
| the p-value of the test. |
method
|
the string "Kruskal-Wallis rank sum test".
|
data.name
| a character string giving the names of the data. |