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From Pei Chen <chen...@apache.org>
Subject Re: Chest pain absent. - polarity
Date Sat, 15 Nov 2014 22:16:26 GMT
Petr,
Which version of cTAKES are you using? < 3.2.0 or latest 3.2.1-rc1/trunk?
Both default to use a Machine Learning based polarity algorithm.  If it is
missed, more training examples is probably the way to go.
The latest one uses clearTK and trained with different features and
training data so I would be curious to see if that one picks up your
examples.

On Sat, Nov 15, 2014 at 11:04 AM, Petr Zalesky <pzalesky@inferscience.com>
wrote:

> I have been investigating how polarity on a sign/symptom gets set and ran
> into interesting issue. If a physician's note in a history of present
> illness (HPI) says something like:
>
> “Absence of chest pain.”
>
> “Denied chest pain.”
>
> “Chest pain resolved.”
>
> Then cTAKES picks up the term "chest pain", assigns it the correct SNOMED
> codes and sets the polarity to -1.  However, some of the de-identified
> samples say:
>
> "Chest pain absent."
>
> In this case it is also picked up by cTAKES but in this case the polarity
> is set to positive one (1).  I have been trying to figure out if there is a
> way to configure cTAKES to detect that.  Any suggestions?
>

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