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...d carefully qh-impre.htm and I still do not understand why I get this message. A simple call to plot(coord) shows that the points are not aligned, nor very close. What did I miss? Thanking you in advance, Jean-Luc Dupouey INRA-Lorrain University Forest Ecology & Ecophysiology Unit F-54280 Champenoux France mail: dupouey at nancy.inra.fr

...st(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: dupouey@nancy.inra.fr [[alternative HTML version deleted]]