Discussion
We have Market Basket data for 1,000 rental transactions at a Video Store. There are four videos for rent -- Video A, Video B, Video C and Video D. The probability that Video D will be rented given that Video C has been rented is known as ________ .
Answer: D
Correct answer: confidence
Confidence is the conditional probability of one item given another - the probability that Video D is rented given that Video C has been. Support is the unconditional probability of the pair occurring together, and lift is the ratio of confidence to the base rate of D, which shows whether C actually makes D more likely.
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