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Opinion Mining

Hello everyone,
I needed a tool to do opinion mining and sentiment analysis and I found RapidMiner. I can remove stop words in a sentence but how can I identify and analyse negative/positive words in a sentence by using RapidMiner? I search in Text Processing operators but I can't really find, also I don't exactly know how complicated operators are used although I watched video tutorials.
Any help, please?
Thanks

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Bing Liu has done a lot of work in this area

Read information here

http://www.cs.uic.edu/~liub/FBS/sentiment-analysis.html

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