fisher.test(x, y, alternative = "two.sided")
x
| either a two-dimensional contingency table in matrix form, or a factor object. |
y
|
a factor object; ignored if x is a matrix.
|
alternative
|
indicates the alternative hypothesis and must be
one of "two.sided" , "greater" or "less" . You
can specify just the initial letter. Only used in the 2 by 2 case.
|
fisher.test
performs Fisher's exact test for testing the null
of independence of rows and columns in a contingency table with fixed
marginals.
If x
is a matrix, it is taken as a two-dimensional contingency
table, and hence its entries should be nonnegative integers.
Otherwise, both x
and y
must be vectors of the same
length. Incomplete cases are removed, the vectors are coerced into
factor objects, and the contingency table is computed from these.
Currently, only 2 by 2 tables can be tested.
"htest"
containing the following components:
p.value
| the p-value of the test. |
alternative
| a character string describing the alternative hypothesis. |
method
|
the string "Fisher's Exact Test for Count Data" .
|
data.name
| a character string giving the names of the data. |