4. The computer implemented method as in claim 1 wherein identifying the importance of the non-sentiment topic words in each of the sentiment categories comprises calculating for each non-sentiment topic word a word support value for the non-sentiment topic word.
4. The computer implemented method as in claim 1 wherein identifying the importance of the non-sentiment topic words in each of the sentiment categories comprises calculating for each non-sentiment topic word a word support value for the non-sentiment topic word. 5. The computer implemented method as in claim 4 wherein identifying the importance of the non-sentiment topic word in each of the sentiment categories further comprises calculating for each non-sentiment topic word a Pointwise Mutual Information value for the non-sentiment topic word.