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begincol
2010 Aug 17
3
Weird differing results when using the Wilcoxon-test
...lcoxon test in R.
As far as I understood, there are mainly two versions:
1) wilcox.test{stats}, which is the default and an approximation, especially,
when ties are involved
2) wilcox_test{coin}, which does calculate the distribution _exactly_ even,
with ties.
I have the following scenario:
#---BeginCode---
# big example
size = 60
big1 = rnorm(size, 0, 1)
big2 = rnorm(size, 0.5, 1
g1f = rep(1, size)
g2f = rep(2, size)
big = c(big1, big2)
data_frame = data.frame(big, gr=as.factor(c(g1f, g2f)))
wilcox_approx = wilcox.test(big1, big2)
wilcox_exact = wilcox_test(big ~ gr, data=data_frame, distributi...