Monday, May 14, 2012

Precision and Recall in plain English

In Information Retrieval,

Precision is the fraction of retrieved documents that are relevent to the user's information need. This measures whether the mix of retrieved results has a lot of bad things in it.

Recall is the faction of relevent documents in collection that are retrieved. This measures how much of the good information in the document collection is the system succeed in finding.

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