4 http://nlp.stanford.edu/software/ corenlp.shtml 5 Statistically significant at p < .05 using the approximate randomization test (Noreen, 1989)     piled comparative keyphrases from (Jindal and Liu, 2006a) in addition to the POS tags.
the data is noisy, for the same predicate sometimes entity-is before the predicate, sometimes entity+.