Of these, a small number (around 2-3% of the whole corpus) do not agree with existing annotations, and cursory inspection yielded a mixture of clear errors (a prepositional phrase with the NP node label), likely errors (an adverb that post-modifies a PP), and cases where only experts in the Tiger annotation scheme could make a firm prediction.
the modeling-based approach would find parses where an extraposed constituent was attached to a VP according to both parsers but to the S node in the treebank.