Our further evaluation reveals that the performance improvement difference among different domains of the ACE 2003 corpus is due to the distribution of pronouns' antecedents occurring over different sentence distances, as shown in Table 4.
their experiments on the ACE 2003 corpus shows that, while the two semantic role features much improve the performance of common noun resolution by 3.8 and 2.7 in F-measure on the BNEWS and NWIRE domains respectively, they only slightly improve the performance of pronoun resolution by 0.4 and 0.3 in F-measure on the BNEWS and NWIRE domains respectively.