Mantel-Haenszel Chi-Square Test for Count Data
Usage
mantelhaen.test(x, y = NULL, z = NULL, correct = TRUE)
Arguments
x
|
either an array of dimension 2 by 2 by s, where s is the
number of strata, or a dichotomous factor object.
|
y
|
a dichotomous factor object; ignored if x is an array.
|
z
|
a factor object idenitifying to which stratum the
corresponding elements in x and y belong; ignored if
x is an array.
|
correct
|
a logical indicating whether to apply continuity
correction when computing the test statistic.
|
Description
mantelhaen.test
performs a Mantel-Haenszel chi-square test of
the null that x
and y
are conditionally independent in
each stratum.
If x
is an array, it must be of dimension 2 by 2 by s, and the
entries should be nonnegative integers. NA
's are not allowed.
Otherwise, x
, y
and z
must have the same length.
Triples containing NA
's are removed. Both x
and
y
must be dichotomous (take exactly 2 values).
Value
A list with class "htest"
containing the following components:
statistic
|
the Mantel-Haenszel chi-square statistic.
|
parameter
|
always 1, the degrees of freedom of the approximate
chi-square distribution of the test statistic.
|
p.value
|
the p-value of the test.
|
method
|
a string indicating the method employed, and whether or
not continuity correction was used.
|
data.name
|
a character string giving the names of the data.
|