Patent ID: 8532981

Claim:
A method for generating a polar vocabulary comprising: extracting textual content from reviews in a corpus of reviews, each of the reviews including an author's rating; identifying a set of frequent nouns from the textual content of the reviews; extracting adjectival terms from the textual content of the reviews, each adjectival term being associated in the textual content with one of the frequent nouns; and with a processor, generating a polar vocabulary including at least some of the extracted adjectival terms, a polarity measure being associated with each adjectival term in the vocabulary which is based on the ratings of the reviews from which the adjectival term was extracted, the generating of the polar vocabulary comprising identifying a set of positive reviews and a set of negative reviews, based on the ratings, and computing, for an identified adjectival term, a measure of its occurrence in the positive and negative sets of reviews, the polarity measure of the term being based on the measure of occurrence.