Overall, the use of pruning boosts system performance from an F-measure of 69.3 to 69.5, and from 57.2 to 63.4 for the MUC-6 and MUC-7 data sets, respectively, enabling the system to achieve performance that surpasses that of the best MUC coreference systems by 4.6% and 1.6%.
the system outperforms the best-performing learningbased coreference system (Soon et al., 2001) by 6.9% and 3.0%.