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bethatkinson / rpart

Recursive Partitioning and Regression Trees
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how to get the improve value？ #59

Open A-Pai opened 7 months ago

A-Pai commented 7 months ago

https://cran.r-project.org/web/packages/rpart/vignettes/longintro.pdf

p20： image

it is said in p22： image

I know the default impurity index is gini，but I can not get to know exactly how to calculate it

A-Pai commented 7 months ago

See p58

image