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An IR system returns 30 relevant documents, and 17 irrelevant documents. There is a total of...

An IR system returns 30 relevant documents, and 17 irrelevant documents. There is a total of 90 relevant documents in the collection. What is the precision of the system on this search, and what is its recall (include the calculation steps in your answer)?

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Answer #1

Relevant documents = 30

Irrelevant documents = 17

Total relevant documents in collection = 90

Therefore, Precision = 30/(30+17) = 30/47 = 0.638

and Recall = 30 / 90 = 0.333

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