[R] "Where" command in ctree (party)

[Achim Zeileis]

On Fri, 17 Feb 2012, josephw wrote:

> i run class(). Both have the same class.

Without a reproducible example it is hard to say what is going on here. 
All columns of the learning and the test data need to have (a) the same 
name, (b) the same class, (c) the same levels in case they are factors.

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