We use the following metrics for evaluation: The proportion of non-root words that are assigned the correct head<cite> (Yamada and Matsumoto, 2003)</cite> . The proportion of root words that are analyzed as such<cite> (Yamada and Matsumoto, 2003)</cite> . The proportion of sentences whose unlabeled dependency structure is completely correct<cite> (Yamada and Matsumoto, 2003)</cite> .