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<Paper uid="W00-0725">
  <Title>A Comparison of PCFG Models*</Title>
  <Section position="5" start_page="124" end_page="124" type="concl">
    <SectionTitle>
4 Conclusion
</SectionTitle>
    <Paragraph position="0"> We have investigated the applicability of a PCFG model based on the extension of k-gram models described in (Rico-Juan et al., 2000).</Paragraph>
    <Paragraph position="1"> The perplexity of the test sample decreases when a combination of models with k = 2 and k = 3 is used to predict string probabilities. We are at present checking that the behavior also holds for other quality measures as the precision and recall of parses of sentences that express strong equivalence between the model and the data.</Paragraph>
  </Section>
class="xml-element"></Paper>