Hwa, Rebecca2016-01-041998Hwa, Rebecca. 1998. An Empirical Evaluation of Probabilistic Lexicalized Tree Insertion Grammars. Harvard Computer Science Group Technical Report TR-06-98.http://nrs.harvard.edu/urn-3:HUL.InstRepos:23996081We present an empirical study of the applicability of Probabilistic Lexicalized Tree Insertion Grammars (PLTIG), a lexicalized counterpart to Probabilistic Context-Free Grammars (PCFG), to problems in stochastic natural-language processing. Comparing the performance of PLTIGs with non-hierarchical N-gram models and PCFGs, we show that PLTIG combines the best aspects of both, with language modeling capability comparable to N-grams, and improved parsing performance over its non-lexicalized counterpart. Furthermore, training of PLTIGs displays faster convergence than PCFGs.en-USResearch Paper or Report2016-01-04