It is known that certain cue words and phrases ( Hirschberg and Litman 1993 ) can serve as explicit indicators of discourse structure .
empirical studies on the disambiguation of cue phrases
Julia B Hirschberg Diane J Litman
DA labeling accuracy results should be compared to a baseline ( chance ) accuracy of 35 % , the relative frequency of the most frequent DA type ( STATEMENT ) in our test set .4 5.1 Dialogue Act Classification Using Words DA classification using words is based on the observation that different DAs use distinctive word strings . It is known that certain cue words and phrases ( Hirschberg and Litman 1993 ) can serve as explicit indicators of discourse structure . Similarly , we find distinctive correlations between certain phrases and DA types .
It is known that certain cue words and phrases ( @@CITATION ) can serve as explicit indicators of discourse structure .