[R] contingency table

From: Carla Rebelo <crebelo_at_liaad.up.pt>
Date: Thu, 14 Feb 2008 10:31:22 +0000


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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