| Introduction | Sentiment lexicon construction and topic lexicon extraction are two fundamental subtasks for opinion mining (Qiu et al., 2009). |
| Introduction | A sentiment lexicon is a list of sentiment expressions, which are used to indicate sentiment polarity (e.g., positive or negative). |
| Introduction | The sentiment lexicon is domain dependent as users may use different sentiment words to express their opinion in different domains (e. g., different products). |
| Experiments | To learn the Max-Ent parameters 2 of MESAS, we used the sentiment lexicon 4 of (Hu and Liu, 2004) to automatically generate training data (no manual labeling). |
| Experiments | Of those 1000 terms if they appeared in the sentiment lexicon , they were treated as sentiment terms, else aspect terms. |
| Experiments | Clearly, labeling words not in the sentiment lexicon as aspect terms may not always be correct. |