Dear R-forumites,
I want to apply a Wilcoxon test on subsets of the data frame mydata,
splitted using the myindice variable. When I send :
wilcoxtest <- by(mydata, mydata$myindice, function(x)
{wilcox_test(x$value~x$fact)})
I get :
Error in eval(expr, envir, enclos) : object "x" not found
whereas
wilcoxtest <- by(mydata, mydata$myindice, function(x)
{wilcox.test(x$value~x$fact)})
works !
Why does it fail with the wilcox_test only? And, most important, how can I
apply the wilcox_test function to subsets of mydata splitted according to
mydata$myindice ?
Thanks in advance,
Jean-Luc Dupouey
Forest Ecology and Ecophysiology Unit
INRA
54280 Champenoux
France
mail: [EMAIL PROTECTED]
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