Does Outliers Affect Decision Tree?

Decision trees are also not sensitive to outliers since the partitioning happens based on the proportion of samples within the split ranges and not on absolute values.

Are tree based models sensitive to outliers?

Since, extreme values or outliers, never cause much reduction in RSS, they are never involved in split. Hence, tree based methods are insensitive to outliers.

Does outliers affect random forest?

Also, output outliers will affect the estimate of the leaf node they are in, but not the values of any other leaf node. ... So output outliers have a “quarantined” effect. Thus, outliers that would wildly distort the accuracy of some algorithms have less of an effect on the prediction of a Random Forest.