document: Opinion observer : analyzing and comparing opinions on the Web The Web has become an excellent source for gathering consumer opinions . There are now numerous Web sites containing such opinions , e.g. , customer reviews of products , forums , discussion groups , and blogs . This paper focuses on online customer reviews of products . It makes two contributions . First , it proposes a novel framework for analyzing and comparing consumer opinions of competing products . A prototype system called Opinion Observer is also implemented . The system is such that with a single glance of its visualization , the user is able to clearly see the strengths and weaknesses of each product in the minds of consumers in terms of various product features . This comparison is useful to both potential customers and product manufacturers . For a potential customer , he\/she can see a visual side-by-side and feature-by-feature comparison of consumer opinions on these products , which helps him\/her to decide which product to buy . For a product manufacturer , the comparison enables it to easily gather marketing intelligence and product benchmarking information . Second , a new technique based on language pattern mining is proposed to extract product features from Pros and Cons in a particular type of reviews . Such features form the basis for the above comparison . Experimental results show that the technique is highly effective and outperform existing methods significantly .
doc_bio_tags: O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O