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Hi All- Looking for validation on this one: Is it legitimate / useful to calculate R-squared on a decision tree model - overall and specifically with following methodology (with example): 1) Calculate the SSTO on the testing set as SUM(yi - y-bar)^2 2) Calculate the SSE on the testing set by calculating SSE for every leaf node SUM(yi - ybar at leaf node)^2 and then simply adding up the SSE. 3…
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