[R] need explaination on Rpart

[santoshdvn]

Hi,

I am learning decisions trees using R ..I used RPART to create decision
maps. when i saw the summary .. i got 

CP    nsplit   rel error    xerror       xstd

Could anyone make me understand terms here CP,relerror xerror and xstand.

or could you please provide the detailed blog where i can learn,,

Thanks,
Santosh

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