COMP682
Athabasca University (AU )
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COMP682 Data Mining Exam 2026 Graded A+
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---5januari 20262025/2026A+
- 1 
What types of inputs do each of the 3 types of decision trees take? 
ID3: categorical only 
C4.5: numeric and categorical 
CART: numeric and categorical 
 
2 
How do each of the 3 types of decision trees split? 
ID3: max information gain and minimum entropy 
C4.5: information gain and gain ratio 
CART: Gini index and twoing creation 
 
3 
How do each of the 3 types of decision trees handle missing data? 
ID3: does not 
C4.5: omits from calculations 
CART: surrogate splits 
 
4 
What is CBA? 
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