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CS583, UIC

CS583, UIC

Corpus-based approaches (contd)

Use constraints (or conventions) on connectives to identify opinion words (Hazivassiloglou and McKeown, ACL-97; Kanayama and Nasukawa, EMNLP-06; Ding and Liu, 2007). E.g.,

Conjunction: conjoined adjectives usually have the same orientation (Hazivassiloglou and McKeown, ACL-97).

E.g., “This car is beautiful and spacious.” (conjunction)

AND, OR, BUT, EITHER-OR, and NEITHER-NOR have similar constraints.

Learning using

log-linear model: determine if two conjoined adjectives are of the same or different orientations.

Clustering: produce two sets of words: positive and negative

Corpus: 21 million word 1987 Wall Street Journal corpus.

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