<?xml version="1.0" standalone="yes"?>
<Paper uid="P02-1049">
  <Title>What's the Trouble: Automatically Identifying Problematic Dialogues in DARPA Communicator Dialogue Systems</Title>
  <Section position="3" start_page="0" end_page="0" type="intro">
    <SectionTitle>
2 Corpus, Methods and Data
</SectionTitle>
    <Paragraph position="0"> Our experiments apply CLASSIFICATION and REGRESSION trees (CART) (Brieman et al., 1984) to train a Problematic Dialogue Identi er (PDI) from a corpus of human-computer dialogues. CLASSIFICATION trees are used for categorical response variables and REGRESSION trees are used for continuous response variables. CART trees are binary decision trees. A CLASSIFICATION tree speci es what queries to perform on the features to maximize</Paragraph>
  </Section>
class="xml-element"></Paper>