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Table 7 Descriptive statistics of coreference annotations in the CRAFT corpus

From: Coreference annotation and resolution in the Colorado Richly Annotated Full Text (CRAFT) corpus of biomedical journal articles

IDENTITY chains 23,887
APPOSITIVE 4591
Pronouns 4145
Mean IDENT chains per paper 246.3
Median IDENT chains per paper 236
Mean APPOS per paper 47.3
Median APPOS per paper 43
Mean length of IDENT chains 4
Median length of IDENT chains 2
Longest IDENT chain 186
Within-sentence IDENT chains 1495
Between-sentence IDENT chains 22,392