[Rasch] Modeling response time

Finlayson, Ian IFinlayson2 at qmu.ac.uk
Tue Jan 31 20:13:41 AEDT 2017

Hello Stuart,

Stepping away from IRT/Rasch, one possibility that jumps out to me would be to fit a mixed effect regression to the log-transformed response times, using persons and items, and then examine the standardised residuals for observations greater than, say, 2.5 SD from zero. That should highlight response times which are longer than might be expected given the person's average response time and the item's average response time.



-----Original Message-----
From: Rasch [mailto:rasch-bounces at acer.edu.au] On Behalf Of Stuart Luppescu
Sent: 30 January 2017 18:34
To: rasch
Subject: [Rasch] Modeling response time

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?

Stuart Luppescu
Chief Psychometrician (ret.)
UChicago Consortium on School Research

lupp at uchicago.edu
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