Extraction of Comparatives (Jinal and Liu, SIGIR-06, AAAI-06; Liu’s Web Data Mining book)
Recall: Two types of evaluation
Direct opinions: “This car is bad”
Comparisons: “Car X is not as good as car Y”
They use different language constructs.
Direct expression of sentiments are good. Comparison may be better.
Good or bad, compared to what?
Comparative Sentence Mining
Identify comparative sentences, and
extract comparative relations from them.