Text Analysis Of The Interapy Pts Corpus
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Transcript of Text Analysis Of The Interapy Pts Corpus
Computerized Text Analysis in Computer-mediated Therapy
The Interapy Post Traumatic Stress Corpus
Jeroen Ruwaard
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
Treatment: Web-based CBT
Outcome was good, but not for everyone
Impact of Event Scale
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.
Can LIWC detect compliance?
Exposure Reappraisal Closure
Present Past Past / Future
I You I / You
Sense CogMech CogMech
NegEmo PosEmo PosEmo
Example Corpus Data
Reappraisal ClosureExposure
Corpus LIWC ProfileAverage Word Count: 762; 77% words recognized by dictionary
LIWC predicts phase
Phase % of cases correctly classified
1 2 3
Train (n = 250) .85 .80 .64
Test(n = 121) .84 .82 .58
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
Self-exposure
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