Factors Affecting the Accuracy of Korean Parsing

We investigate parsing accuracy on the Korean Treebank 2.0 with a number of different grammars. Comparisons among these grammars and to their English counterparts suggest different aspects of Korean that contribute to parsing difficulty. Our results indicate that the coarseness of the Treebank’s nonterminal set is a even greater problem than in the English Treebank. We also find that Korean’s relatively free word order does not impact parsing results as much as one might expect, but in fact the prevalence of zero pronouns accounts for a large portion of the difference between Korean and English parsing scores.