(4) Pronouns Following (Gundel, et al., 1993), we consider that the evoking power of each of these types of REs decreases as we move down the list.
note that in some cases, the stack-based model performs better than VT, in particular for small k. This occurs when VT searches back through n adjacent left satellites, where n > 1, to find a coreference, but a co-referent is found using the stack-based method by searching back m nonleft satellite units, where m < n. This would be the case, if for instance, VT first found a coreferent for Mr. Clinton In text (4) in D4 (2 units away), but the stack-based model found a coreferent in C4 (1 unit away since the left satellites are not on the stack).