Question
For each of the nodes below, compute the Gini Index & Entropy given their class distributions. Node 1 contains 30 data points 17 points belong
For each of the nodes below, compute the Gini Index & Entropy given their class distributions.
Node 1 contains 30 data points
17 points belong to class C1
13 points belong to class C2
| Node 1 | |
| C1 | 17 |
| C2 | 13 |
Node 2 contains 30 data points
12 points belong to class C1
18 points belong to class C2
| Node 2 | |
| C1 | 12 |
| C2 | 18 |
Node 3 contains 30 data points
15 points belong to class C1
15 points belong to class C2
| Node 3 | |
| C1 | 15 |
| C2 | 15 |
How do the Gini values for the three nodes compare?
Which node is the purest?
Which node has the highest level of impurity?
Can you reach the same results from looking at the Entropy values?
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Database Concepts
Authors: David M. Kroenke, David J. Auer
7th edition
133544621, 133544626, 0-13-354462-1, 978-0133544626
