juniorRandom Forest
What is Gini impurity?
Updated May 17, 2026
Short answer
Gini impurity measures how often a randomly chosen element would be incorrectly classified.
Deep explanation
It is used to decide splits in decision trees. Lower Gini means better purity of nodes.
Real-world example
Used in classification problems like customer segmentation.
Common mistakes
- Confusing Gini with entropy.
Follow-up questions
- What is entropy?
- Which is better, Gini or entropy?