Paper: Extracting Appraisal Expressions

ACL ID N07-1039
Title Extracting Appraisal Expressions
Venue Human Language Technologies
Session Main Conference
Year 2007
Authors

Sentiment analysis seeks to characterize opinionated or evaluative aspects of nat- ural language text. We suggest here that appraisal expression extraction should be viewed as a fundamental task in sentiment analysis. An appraisal expression is a tex- tual unit expressing an evaluative stance towards some target. The task is to find and characterize the evaluative attributes of such elements. This paper describes a system for effectively extracting and dis- ambiguating adjectival appraisal expres- sions in English outputting a generic rep- resentation in terms of their evaluative function in the text. Data mining on ap- praisal expressions gives meaningful and non-obvious insights.