[R] contingency table
John Kane
jrkrideau at yahoo.ca
Fri Feb 15 16:34:30 CET 2008
Have a look at
length(iris$Species)
length(prev)
--- Carla Rebelo <crebelo at liaad.up.pt> wrote:
> Hello!
>
> May you help me? I'm trying to do a contingency
> table using this
>
> > data(iris)
> > library(rpart)
> > modelo <- rpart(Species ~., iris)
> > prev <- predict(modelo, iris)
>
> Finally the contingency table
> > table(iris$Species, prev)
> But an error occurs:
> Error in table(iris$Species, prev) :
> all arguments must have the same length
>
> And I do not understand why, may you help me?
>
> Thank You!
>
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