Opinion Mining From Twitter Feeds Lenin Ravindranath Sivalingam

Opinion Mining From Twitter Feeds Lenin Ravindranath Sivalingam 25 million users around the world Over 10 million tweets a day Tweet Extraction Twitter Keyword Search Just saw 2012 – the movie was good, but not gr 8… CG was awesum… Lexicon Internet slang lexicon Polarized lexicon Tweet Polarized Lexicon Adjective Verb Nouns Adverbs # Positive words 74 29 29 26 # Negative words 67 26 30 11 Tweet Cleaning Phrase Extraction People often express opinions! Richest source of user opinions! Extracting movie reviews! Internet Slang Translation Results just saw MMM the movie was good but not great CG was awesome Spelling Correction Cleaned phrases POS Tagging Just/RB saw/VB MMM/NN The/DT movie/NN was/VB good/JJ But/CC not/RB great/JJ CG/NN was/VB awesome/JJ Tagged phrases Sentiment Analysis on Tweets Just watched 2012, it was pretty good. . . Saw 2012…… worst movie ever…. . waste of time Positive review Negative review 2012 – great effects, worst acting, was ok. Mixed review Went to see 2012 with my girlfriend Not a review Data Collection Crowd Sourcing 3000 tweets tagged by 40 users Feature Extraction (Polar Features) Polar Words Extraction Polarity Analysis (Polarity Reversal) Feature Encoding (Phrase polarity, position) Features SVM Classifier Review Approaches Bag of words Adjectives Polar words Our approach (Negation + Polarity + Position) Classes MMM good/JJ not/RB great/JJ awesome/JJ MMM POS-JJ NEG-RB POS-JJ MMM POS-JJ NEG-JJ POS-JJ 1: 0 3: 1 5: 0 7: 1 2: 0 4: 0 6: 1 8: 0 1: 0 2: 0 3: 1 4: 0 5: 0 6: 1 7: 1 8: 0 Mixed review Positive review tweets Negative review tweets Mixed review tweets No review tweets Classifying subjective/objective tweets Correct prediction 80. 84% 69. 03% 57. 67% 80. 78% Correct prediction 39. 24% 44. 27% 58. 34% 76. 53% Number of phrases to include as features 83. 50% Why errors? Ambiguous polar words Couples Retreat was hilarious. Too much slang New moon was ahhwwesum. . No polar words I just saw 2012. I need my money back. Different context I saw 2012 today with my girlfriend. I love her. 2012 was hilarious.