Discussion
We have Market Basket data for 1,000 rental transactions at a Video Store. There are for videos for rent -- Video A, Video B, Video C and Video D. The probability that both Video C and Video D are rented at the same time is known as ________ .
Answer: B
Correct answer: support
Support is the probability that a set of items appears together in a transaction - here the fraction of the thousand rentals containing both Video C and Video D. It is an unconditional probability of the whole combination. Confidence, by contrast, is conditional: the probability of D given that C was rented.
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