On 12/12/2008 3:29 AM, robert-mcfad...@o2.pl wrote:
> Hello,
> Which package allows to use Cochrana-Armitage trend test? I tried to search
> for but I found only package coin in which there is no explicit function.
But there is this example in coin:
### Cochran-Armitage trend test for proportions
### Lung tumors in female mice exposed to 1,2-dichloroethane
### Encyclopedia of Biostatistics (Armitage & Colton, 1998),
### Chapter Trend Test for Counts and Proportions, page 4578, Table 2
lungtumor <- data.frame(dose = rep(c(0, 1, 2), c(40, 50, 48)),
tumor = c(rep(c(0, 1), c(38, 2)),
rep(c(0, 1), c(43, 7)),
rep(c(0, 1), c(33, 15))))
table(lungtumor$dose, lungtumor$tumor)
### Cochran-Armitage test (permutation equivalent to correlation
### between dose and tumor), cf. Table 2 for results
independence_test(tumor ~ dose, data = lungtumor, teststat = "quad")
See the following:
http://finzi.psych.upenn.edu/R/library/coin/html/ContingencyTests.html
There also is an implementation in the GeneticsBase package
(Bioconductor).
> Best,
> RobMac
>
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