Question



Explain node impurity further

Mr. Ballings,

There is no concrete definition of node impurity in your book or one that is very useful on google. Could you explain exactly what node
impurity is and how it pertains to decision trees/random forests?

Thanks,
John





Answers and follow-up questions





Answer or follow-up question 1

Dear John,

Node impurity is defined in the decision tree section (see Gini impurity). It is also explained in the random forest section as the mean
descrease in Gini.

Michel Ballings



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