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CS583, UIC

CS583, UIC

Subjectivity and polarity (orientation) (Yu and Hazivassiloglou, EMNLP-03)

For subjective or opinion sentence identification, three methods are tried:

Sentence similarity.

Naïve Bayesian classification.

Multiple naïve Bayesian (NB) classifiers.

For opinion orientation (positive, negative or neutral) (also called polarity) classification, it uses a similar method to (Turney, ACL-02), but

with more seed words (rather than two) and based on log-likelihood ratio (LLR).

For classification of each word, it takes the average of LLR scores of words in the sentence and use cutoffs to decide positive, negative or neutral.

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