| Challenge: | Existing studies have shown positive words are more frequently used in negative reviews . however, it remains unclear whether the Pollyanna hypothesis holds in negative review . |
| Approach: | They validate the Pollyanna hypothesis that positive words occur more frequently than negative words in human expressions . they use a variety of review datasets to examine the use of positive and negative words . |
| Outcome: | The results confirm the pollyanna hypothesis that positive words occur more frequently than negative words in human expressions. |
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