sentiment

Irresponsible minor outspoken pleasant reckless risky

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Unformatted text preview: l l l 0.16 l l 0.13 0.11 0.08 l 0.1 l l l 1 2 3 4 5 6 7 8 l 0.12 l l l l l l l l l l l l l l 10 l 0.04 l 9 l l l l 0.03 l 1 2 3 4 5 6 7 8 9 10 1 Rating 2 3 4 5 6 7 8 l l 9 l 10 l 0.03 1 2 3 4 5 6 7 l l l 8 9 10 Dan Jurafsky Other sen%ment feature: Logical nega%on PoXs, Christopher. 2011. On the nega+vity of nega+on. SALT 20, 636 ­659. •  Is logical nega+on (no, not) associated with nega+ve sen+ment? •  PoXs experiment: •  Count nega+on (not, n’t, no, never) in online reviews •  Regress against the review ra+ng Dan Jurafsky Po;s 2011 Results: More nega%on in nega%ve sen%ment Scaled likelihood P(w|c)/P(w) a Sentiment Analysis Sen+ment Lexicons Sentiment Analysis Learning Sen+ment Lexicons Dan Jurafsky Semi ­supervised learning of lexicons •  Use a small amount of informa+on •  A few labeled examples •  A few hand ­built paXerns •  To bootstrap a lexicon 48 Dan Jurafsky Hatzivassiloglou and McKeown intui%on for iden%fying word polarity Vasileios Hatzivassiloglou and Kathleen R. McKeown. 1997. Predic+ng the Seman+c Orienta+on of Adjec+ves. ACL, 174–181 •  Adjec+ves conjoined by “and” have same polarity •  Fair and legi+mate, corrupt and brutal •  *fair and brutal, *corrupt and legi+mate •  Adjec+ves conjoined by “but” do not •  fair but brutal 49 Dan Jurafsky Hatzivassiloglou & McKeown 1997 Step 1 •  Label seed set of 1336 adjec+ves (all >20 in 21 million word WSJ corpus) •  657 posi+ve •  adequate central clever famous intelligent remarkable reputed sensi+ve slender thriving… •  679 nega+ve •  contagious drunken ignorant lanky listless primi+ve strident troublesome unresolved unsuspec+ng… 50 Dan Jurafsky Hatzivassiloglou & McKeown 1997 Step 2 •  Expand seed set to conjoined adjec+ves nice, helpful nice, classy 51 Dan Jurafsk...
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