Text Analysis Of The Interapy Pts Corpus
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Transcript of Text Analysis Of The Interapy Pts Corpus
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Computerized Text Analysis in Computer-mediated Therapy
The Interapy Post Traumatic Stress Corpus
Jeroen Ruwaard
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Corpus Description
4255 texts written by 478 traumatized clients starting online CBT after GP referral for psychotherapy
Demographics, trauma profile, outcome data (pre -
post – 6 week follow-up), process data
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Treatment: Web-based CBT
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Outcome was good, but not for everyone
Impact of Event Scale
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Linguistic Inquiry and Word Count(LIWC)
Calculates the degree to which people use different categories of words - Pennebaker et al. 1993 – Present
I looked inside the car and realised that I knew the face. I had seen him take my teacher to school before. I hesitated a bit. When he saw my hesitation, he said, "Don't you always see this car by your school? I always take some teachers to school. I was relieved and I went into the car. He drove off and while on the way he started a conversation. He asked if I had a boyfriend and I told him no, so he asked why a pretty girl like me didn't have a boyfriend. I told him I was just 14 and was not ready. I became aware that he was looking at me, so I tried to avoid his questions.
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Can LIWC detect compliance?
Exposure Reappraisal Closure
Present Past Past / Future
I You I / You
Sense CogMech CogMech
NegEmo PosEmo PosEmo
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Example Corpus Data
Reappraisal ClosureExposure
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Corpus LIWC ProfileAverage Word Count: 762; 77% words recognized by dictionary
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LIWC predicts phase
Phase % of cases correctly classified
1 2 3
Train (n = 250) .85 .80 .64
Test(n = 121) .84 .82 .58
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Does LIWC predict outcome?
Word Category
Main effect
Interaction
Linear Quadratic Cubic
I
You
Senses
CogMech
NegEmo
PosEmo
Present
Past
Future
Word Count
p < .01
p < .05
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Self-exposure
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Summary & Conclusion
LIWC mirrors instructions and intented
therapeutic effects explains small part of the variance in
outcome
More probabilistic approaches of computerized analysis might reveal more