[R] NPMC

[Moimt]

HI,
I am a new user of R and want to analyse some data using npmc. My data have
several levels of factor (Site, Year and Season) and several variable
(Percentages).
I have tried to use npmc but I always get an error message. My data are in a
table following this example:

Site    YEar    Season    Var1     Var2   ....
A       2009    Dry          10        56
B   ........

here is the error message I get: Erreur dans as.vector(x, mode) : argument
'mode' incorrect.

How should I use the npmc formula?

Thank you for your help
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