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3.5.1.3: Precision-Recall-Diagram

Let Dq=(ds1,...,dsk) be a completely ordered result set and Rq={dD | r(d,q)=1} the set of relevant documents for the query q . Let further (dt1,...,dtl) be the intersection DqRq ordered according to Dq . The sequence (Ri(q,D),Pi(q,D))i=1,...,l with

and

with dsj=dti is called the Precision-Recall-Diagram of q .
It can be displayed by points in the square [0,1]2 .

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