Extracting Appraisal Expressions

Sentiment analysis seeks to characterize opinionated or evaluative aspects of natural language text. We suggest here that appraisal expression extraction should be viewed as a fundamental task in sentiment analysis. An appraisal expression is a textual 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 disambiguating adjectival appraisal expressions in English outputting a generic representation in terms of their evaluative function in the text. Data mining on appraisal expressions gives meaningful and non-obvious insights.

• Type: Conference
• Year: 2007
• Where: NAACL
• Authors: Kenneth Bloom, Navendu Garg, Shlomo Argamon
• Keywords: Appraisal Expressions, Computational Linguistics, Evaluative, NAACL 2007, Sentiment Analysis