vcd (version 1.4-13)

woolf_test: Woolf Test

Description

Test for homogeneity on $2\times 2\times k$ tables over strata (i.e., whether the log odds ratios are the same in all strata).

Usage

woolf_test(x)

Value

A list of class "htest" containing the following components:

statistic

the chi-squared test statistic.

parameter

degrees of freedom of the approximate chi-squared distribution of the test statistic.

p.value

$p$-value for the test.

method

a character string indicating the type of test performed.

data.name

a character string giving the name(s) of the data.

observed

the observed counts.

expected

the expected counts under the null hypothesis.

Arguments

x

A $2\times 2\times k$ table.

References

Woolf, B. 1955. On estimating the relation between blood group and disease. Ann. Human Genet. (London) 19, 251-253.

See Also

mantelhaen.test

Examples

data("CoalMiners")
woolf_test(CoalMiners)