Attitude is not only lexical
Constructions and lexical items in parallel

Jussi Karlgren, Gunnar Eriksson, Oscar Täckström
Swedish Institute of Computer Science
Kista, Sweden

Most categorisation features are term occurrence based
Utterances are sequences of words:“w1w2...wi...wj ...wn”

frequency features Is some term wi unusually frequent or infrequent?
cooccurrence features Is some combination of terms wi, wj unusually frequent or infrequent?
equivalence classes Can some term wi be substituted or generalised to a class or concept marker?
But utterances are more than the words that appear in them. The pattern of an utterance is an observable item initself.

rank weight f eature
75 1.874 Tense shift
269 1.375 Past tense
281 1.356 Verb particle
290 1.338 Transitivity mix
385 1.206 Adverbial of quantity
502 1.082 Predicative
505 1.080 Quantifier
680 0.943 Non-transitive clause
686 0.938 Negation
746 0.902 Adverbial of time
780 0.881 Transitive clause813 0.862 Prepositional modifier
969 0.774 Non-adverbial prepositional phrase
1055 0.738 Comparative adjective
1105 0.712 Verb chain
1673 0.468 Present tense2222 0.285 Adverbial of condition

Results
The results for our best run (sics-1), using a support vector machine forcategorisation
Run

Opinionated task
Precision Recall F

sics-1 0.419

Polarity task
Precision Recall F

0.610 0.497 0.184

Constructions

0.241 0.209“It is this, I think, that commentators mean when they say glibly that the “world changed” after Sept 11.”
“President Hafez Al-Assad has said that peace was a pressing need for the region and the world at large and Syria, considering
peace a strategic option would take steps towards peace.”“Mr Cohen, beginning an eight-day European tour including a Nato defence ministers’ meeting in Brussels today and tomorrow, said he expected further international action soon, though not necessarily military intervention.”
03 st2001 043707 0067 ntcir: opinion, neutral sics-1: opinion, positive
I be think commentator mean when say glibly world change sept 11
F it this i that they that the after
K Adverbial of time, Adverbial of manner, That subclause, Predicative, Intransitive clause, Transitive clause, Transitive mix, Present tense, Past tense, Tense shift
n10 xie19991227.0057 0007 ntcir: opinion, neutral; sics-1: opinion, neutral
I president hafez al-assad have say peace be pressing need region world at large syria consider peace strategic option would take step peace
F that a for the and the and a towards
K Adverbial of manner, That subclause, Predicative, Intransitive, Transitive clause, Transitive mix, Present tense, Past tense, Tense shift, Verb chain
n05 st1998 027077 0009 ntcir: non-opinion; sics-1: non-opinion
I mr cohen begin eight-day european tour include nato defence minister meeting brussels today tomorr ow say expect international action
soon though not necessarily military intervention
F an a in and he further
K Adverbial of time, Adverbial of place, That subclause, Transitive clause, Past tense

Relative strength of the various feature types
100

90908080
F1 / Relative Feature Weight

F1 / Relative Feature Weight100

F1-scores / Relative Feature Weights

7060
50403020

F1 (ATT)
Weight I
Weight K
Weight F

Micro Average F1
Weight I
Weight K
Weight F

706050403020100 3000

F1-scores / Relative Feature Weights102500

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Number of Features

2000