[Rasch] c-parameter

Rense Lange rense.lange at gmail.com
Sun Jun 3 06:41:07 EST 2012


One down (guessing), one to go (discrimination)

On Jun 2, 2012, at 12:45 AM, Purya Baghaei <puryabaghaei at gmail.com> wrote:

> What I found exciting was that the paper says:
> 
> "...the c-parameter of 3PLM should not be interpreted as a guessing
> parameter. This study found logical, empirical evidence showing that
> neither the a-, b-, or c parameters of 3PLM can accurately reflect the
> discrimination, difficulty, and guessing properties of an item,
> respectively".
> 
> I read of of problems associated with IRT, but didn't know they were so serious.
> 
> Purya
> 
> On 5/31/12, Tom Conner <connert at msu.edu> wrote:
>> Not sure why it is exciting.  It just brings up the old issue of
>> changing the model if it doesn't fit (e.g., adding parameters at the
>> expense of measurement properties) or keeping the model and its
>> measurement properties and do things like modify items or administration
>> conditions.
>> 
>> Tom
>> 
>> On 5/31/12 4:39 AM, Purya Baghaei wrote:
>>> Hi folks,
>>> Have you seen this? Very exciting!
>>> 
>>> http://pareonline.net/pdf/v17n1.pdf
>>> 
>>> Purya
>>> 
>> 
>> --
>> Tom Conner
>> Professor Emeritus
>> Department of Sociology
>> Michigan State University
>> "What if there were no hypothetical questions?"
>> 
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> 
> 
> -- 
> Purya Baghaei, Ph.D
> English Department,
> Islamic Azad University,
> Ostad Yusofi St.
> 91871-Mashhad, Iran.
> Phone: +98 511 6635064-5
> Fax: +98 511 6634763
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