That's a scoping problem, I think a bug in oneway_test. Because the formula
var ~ group is created with the anonymous function within lapply, its
environment should be the evaluation frame of that function call and var
should be visible. If I replace oneway_test() with lm() it works.
I think a workaround is to construct the data argument explicitly, i.e.
lapply(y, function(var) oneway_test(var ~ group, data.frame(var=var,
group=group)))
yes, that would be the fix:
R> lapply(y, function(var) oneway_test(var ~ group,
data = data.frame(var = var, group = group)))
$V1
Asymptotic 2-Sample Permutation Test
data: var by group (1, 2)
Z = -1.2054, p-value = 0.2280
alternative hypothesis: true mu is not equal to 0
$V2
Asymptotic 2-Sample Permutation Test
data: var by group (1, 2)
Z = 0.5672, p-value = 0.5706
alternative hypothesis: true mu is not equal to 0
Thanks, Duncan.
Torsten
I've cc'd Torsten Hothorn, the maintainer of coin.
Duncan Murdoch
Thank you,
Matthieu
Matthieu Dubois
Post-doctoral fellow
Psychology and NeuroCognition Lab (CNRS UMR 5105)
Université Pierre Mendès-France
BP47 --- 38040 Grenoble Cedex 9 --- France
Email: matthieu.dub...@upmf-grenoble.fr
Gmail: matth...@gmail.com
http://web.upmf-grenoble.fr/LPNC/membre_matthieu_dubois
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