Lee, Alan

Email Address
ORCID
Disciplines
Research Projects
Organizational Units
Position
Introduction
Research Interests

Filters

2007 - 20082
2
2
Reset filters

Settings

Search Results

Now showing 1 - 2 of 2
  • Publication
    The Penn Discourse Treebank 2.0 Annotation Manual
    (2007-12-17) Prasad, Rashmi; Miltsakaki, Eleni; Dinesh, Nikhil; Lee, Alan; Joshi, Aravind; Robaldo, Livio; Webber, Bonnie L
    This report contains the guidelines for the annotation of discourse relations in the Penn Discourse Treebank (http://www.seas.upenn.edu/~pdtb), PDTB. Discourse relations in the PDTB are annotated in a bottom up fashion, and capture both lexically realized relations as well as implicit relations. Guidelines in this report are provided for all aspects of the annotation, including annotation explicit discourse connectives, implicit relations, arguments of relations, senses of relations, and the attribution of relations and their arguments. The report also provides descriptions of the annotation format representation.
  • Publication
    Easily Identifiable Discourse Relations
    (2008-06-16) Pitler, Emily; Raghupathy, Mridhula; Mehta, Hena; Nenkova, Ani; Lee, Alan; Joshi, Aravind K
    We present a corpus study of local discourse relations based on the Penn Discourse Tree Bank, a large manually annotated corpus of explicitly or implicitly realized contingency, comparison, temporal and expansion relations. We show that while there is a large degree of ambiguity in temporal explicit discourse connectives, overall discourse connectives are mostly unambiguous and allow high accuracy classification of discourse relations. We achieve 93.09% accuracy in classifying the explicit relations and 74.74% accuracy overall. In addition, we show that some pairs of relations occur together in text more often than expected by chance. This finding suggest that global sequence classification of the relations in text can lead to better results, especially for implicit relations.