Given a goldstandard (i.e., key) partition, KP , and a systemgenerated (i.e., response) partition, RP , B 3 computes the recall and precision of each NP and averages these values at the end.
for each NP, NP j , B 3 first computes the number of NPs that appear in both KP j and RP j , the clusters containing NP j in KP and RP , respectively, and then divides this number by |KP j | and |RP j | to obtain the recall and precision of NP j , respectively.