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Questions and Answers
What does the confidence of X → Y measure?
What does the confidence of X → Y measure?
- The percentage of transactions that contain X and Y
- The percentage of transactions that contain X
- The ratio of transactions containing X and Y to the number of transactions containing X (correct)
- The ratio of transactions containing X to the number of transactions containing X and Y
In Example 1, if the number of transactions in the dataset is 10 and the number of transactions containing X and Y is 3, what is the support of X → Y?
In Example 1, if the number of transactions in the dataset is 10 and the number of transactions containing X and Y is 3, what is the support of X → Y?
- 30%
- 0.3
- 10/3
- 3/10 (correct)
What is the formula for calculating the support of X → Y?
What is the formula for calculating the support of X → Y?
- $Support(X \rightarrow Y) = \frac{X \cup Y}{X}$
- $Support(X \rightarrow Y) = \frac{X \cap Y}{X}$
- $Support(X \rightarrow Y) = \frac{X \cap Y}{D}$
- $Support(X \rightarrow Y) = \frac{X \cup Y}{D}$ (correct)
If the number of transactions containing X and Y is 4, and the number of transactions containing X is 6, what is the confidence of X → Y?
If the number of transactions containing X and Y is 4, and the number of transactions containing X is 6, what is the confidence of X → Y?
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What is the confidence of A → D in Example 1, if the number of transactions containing A and D is 2 and the number of transactions containing A is 5?
What is the confidence of A → D in Example 1, if the number of transactions containing A and D is 2 and the number of transactions containing A is 5?
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