The coreferential chain length of a candidate, or its variants such as occurrence frequency and TFIDF, has been used as a salience factor in some learning-based reference resolution systems (Iida et al., 2003;Mitkov, 1998;Paul et al., 1999;Strube and Muller, 2003).
for an entity, the coreferential length only reflects its global salience in the whole text(s), instead of the local salience in a discourse segment which is nevertheless more informative for pronoun resolution.