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Rsquare for regresstion tree

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Tania
Tania on 13 Jul 2014
Commented: Ilya on 14 Jul 2014
Hey! Does anyone know how I can calculate the rsquare for a regression tree?
Thank you!:)

More Answers (1)

Ilya
Ilya on 14 Jul 2014
R-square is the square of the Pearson correlation between predicted and observed response.
R2 = corr(yobs,yhat)^2
for column-vectors yobs and yhat.
  2 Comments
Ilya
Ilya on 14 Jul 2014
yobs and yhat are vectors of observed and predicted response values. You already have them. You can find definitions of R2 in many places such as Wikipedia or textbooks.

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