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<Paper uid="W06-1519">
  <Title>Extracting Syntactic Features from a Korean Treebank</Title>
  <Section position="6" start_page="134" end_page="134" type="evalu">
    <SectionTitle>
4 Evaluations
</SectionTitle>
    <Paragraph position="0"> Finally, extracted grammars are evaluated by its size (see Figure 2) and its coverage (see Table 5).</Paragraph>
    <Paragraph position="1"> The number of tree schemata is not stabilized at the end of the extraction process, which seems to indicate that the size of Treebank is not enough to reach the convergence of extracted grammars.</Paragraph>
    <Paragraph position="2"> However, the number of tree schemata appearing at least twice and three times (threshold = 2 and 3) in Treebank is much stabilized at the end of the extraction process than that of tree schemata appearing only once (threshold = 1).</Paragraph>
    <Paragraph position="3"> The coverage of extracted grammars is calculated not only by the frequency of tree schemata but also by the number of tree schemata.</Paragraph>
    <Paragraph position="4">  We manually overlap our 163 tree schemata for predicates, which contain 14 subcategorization frames with 11 subcategorization frames of a FB-LTAG grammar proposed in Han et al.</Paragraph>
    <Paragraph position="5"> (2000) to evaluate the coverage of hand-crafted  Our extracted tree schemata contain not only subcategorization frames but also some phenomena of syntactic variations, the number of lexicalized trees and the frequency information while Han el al. (2000) only presents subcategorization frames and some phenomena.</Paragraph>
    <Paragraph position="6">  Three subcategorization frames in Han el al. (2000) which contain prepositional phrases are not covered by our extracted tree schemata. Generally, prepositional phrases in SJTree are labeled with _AJT which is marked for adjunction operation. Since there is no difference between noun adverbial phrase and prepositional phrases in SJTree like [S na.neun [NP_AJT ojeon.e 'morning'] [NP_AJT hakgyo.e 'to school'] ga.ss.da] ('I went to school this morning'), we do not consider _AJT phrases as arguments.</Paragraph>
  </Section>
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