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COMP682 Data Mining Exam with Verified Answers 2026

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COMP682 Data Mining
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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? Classification based on association. 5 What is an iceberg cube? An Iceberg-Cube contains only those cells of the data cube that meet an aggregate condition. 6 What is OLAP, ROLAP, and MOLAP? Online analytical processing, Relational OLAP Multidimensional Analytical Processing

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COMP682



COMP682 Data Mining Exam with
Verified Answers 2026
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?
Classification based on association.


COMP682

, COMP682




5
What is an iceberg cube?
An Iceberg-Cube contains only those cells of the data cube that meet an
aggregate condition.


6
What is OLAP, ROLAP, and MOLAP?
Online analytical processing,
Relational OLAP
Multidimensional Analytical Processing


7
What is naïve Bayesian classification? What is the formula?
A probabilistic classifier using Bayes Theorem.
posterior = (prior x likelihood) / evidence
P(A C) = ( P(C|A) P(A) ) / P(C)


8
What is Laplace smoothing?
A way of ensuring that a bayes classifier doesn't return zero due to a divide by
0.


9
What is a single-linkage algorithm?


COMP682

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