WoolfTest {DescTools}  R Documentation 
Woolf Test For Homogeneity in 2x2xk Tables
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
WoolfTest(x)
Arguments
x 
a 
Value
A list of class "htest"
containing the following
components:
statistic 
the chisquared test statistic. 
parameter 
degrees of freedom of the approximate chisquared distribution of the test statistic. 
p.value 

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. 
Note
This function was previously published as woolf_test()
in the vcd package and has been integrated here without logical changes.
Author(s)
David Meyer, Achim Zeileis, Kurt Hornik, Michael Friendly
References
Woolf, B. 1955: On estimating the relation between blood group and disease. Ann. Human Genet. (London) 19, 251253.
See Also
mantelhaen.test
, BreslowDayTest
Examples
migraine < xtabs(freq ~ .,
cbind(expand.grid(treatment=c("active","placebo"),
response=c("better","same"),
gender=c("female","male")),
freq=c(16,5,11,20,12,7,16,19))
)
WoolfTest(migraine)