Calculate the summary statistics for a set of decision trees (e.g., Gini index, entropy, residual sum of squares).
Free CAS MAS-II (Modern Actuarial Statistics II) lesson in Statistical Learning. 12 min read, ~1,848 words.
Regression trees score splits by residual sum of squares (RSS), minimizing where is the regional mean (not the global mean). Classification trees score splits by node impurity: Gini, entropy, or classification error. For two classes, Gini peaks at 0.5 when and entropy peaks at nats; their scales differ, so compare...
Read the full lesson, free →
Worked examples and practice. Free with a free account, no card.
What this lesson covers
- Content
- Example 1
- Example 2
- Common Mistakes
- Check Your Understanding
- Exam Shortcuts
Learning objectives
- C3
Browse all free MAS-II lessons or jump into free MAS-II practice questions.