[Rasch] Rasch Digest, Vol 138, Issue 7

Richard Gershon gershon at northwestern.edu
Tue Jan 31 12:28:31 AEDT 2017


It is very typical to run a logarithmic conversion on timing level data prior to analyzing timing data – I believe that this would help address your skew issue as well. No real opinion on using partial-credit model, but I can’t believe that you really want to create 90 categories in any case!
Richard Gershon

From: Rasch <rasch-bounces at acer.edu.au> on behalf of "rasch-request at acer.edu.au" <rasch-request at acer.edu.au>
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Date: Monday, January 30, 2017 at 7:00 PM
To: "rasch at acer.edu.au" <rasch at acer.edu.au>
Subject: Rasch Digest, Vol 138, Issue 7

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Today's Topics:

   1. Modeling response time (Stuart Luppescu)


----------------------------------------------------------------------

Message: 1
Date: Mon, 30 Jan 2017 13:33:45 -0500
From: Stuart Luppescu <lupp at uchicago.edu<mailto:lupp at uchicago.edu>>
To: rasch <rasch at acer.edu.au<mailto:rasch at acer.edu.au>>
Subject: [Rasch] Modeling response time
Message-ID: <1485801225.29155.19.camel at uchicago.edu<mailto:1485801225.29155.19.camel at uchicago.edu>>
Content-Type: text/plain; charset="UTF-8"

Hello fellow Raschies, I have some item-response-time data that I want
to model, and identify person-item interactions that take an unusually
long period of time, given the expected response time of the person,
and the expected time required by the item. The item-response times
range from 1 second to 90 seconds, and are somewhat positively skewed.?

Can I just apply a Rasch partial-credit model with 90 categories to
these data? If so, recommendations on how to proceed or things to watch
out for?

TIA
--
Stuart Luppescu
Chief Psychometrician (ret.)
UChicago Consortium on School Research
https://urldefense.proofpoint.com/v2/url?u=http-3A__consortium.uchicago.edu&d=CwICAg&c=yHlS04HhBraes5BQ9ueu5zKhE7rtNXt_d012z2PA6ws&r=SPLceyMwN25fP6TKdIkIz2ZBFm9XD-puHON3wxnRSDI&m=sOYWGNIegBXcqEfcNw7LgG-g89YDTLKfmMxibvMMhNA&s=FGoDjjKPvn_DN8314aW-ALFu15_CBWYXum1q77eFv2w&e=

lupp at uchicago.edu<mailto:lupp at uchicago.edu>


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End of Rasch Digest, Vol 138, Issue 7
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