Which of the following correctly defines confidence?

Subject: Machine Learning

Topic: K-Means & Clustering in Unsupervised Learning

Options:

1. Option A: Confidence(A -> B) = P(A∪B) / P(B)
2. Option B: Confidence(A -> B) = P(A∪B) / P(A)
3. Option C: Confidence(A -> B) = P(A) / P(A∪B)
4. Option D: Confidence(A -> B) = P(A∪B) * P(A)

Correct Answer:

Option B: Confidence(A -> B) = P(A∪B) / P(A)

Explanation:

Confidence is the conditional probability of B given A: P(B|A) = P(A∪B) / P(A).