Rsquare for regresstion tree

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Tania
Tania 2014-7-13
评论： Ilya 2014-7-14
Hey! Does anyone know how I can calculate the rsquare for a regression tree?
Thank you!:)

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dpb
dpb 2014-7-13

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Ilya
Ilya 2014-7-14
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 个评论
Tania
Tania 2014-7-14
Thanks dpd for the link, but it only shows how build the mse formula. Thanks llya, i tried to find the yobs & yhat in the documentation, but can not find it. Where did you find these information?
Thank you!
Ilya
Ilya 2014-7-14
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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