[Rasch] Question about difficulty and ability parameters in item response theory

fatemeh khalesi fakhalesi at gmail.com
Wed Aug 14 19:10:59 EST 2013


Thanks a lot.


On Wed, Aug 14, 2013 at 1:36 PM, Mike Linacre <mike at winsteps.com> wrote:

> Fatemeh Khalesi:
>
> A formula for estimating item discrimination is shown in
> http://www.rasch.org/rmt/rmt181b.htm
>
> Ranking students is usually based on their person ability estimate
> (theta). See Mark Moulton's spreadsheet for the Rasch Model.
>
> 2-PL IRT estimation is more complicated. There are free R Statistics
> procedures available, see
> http://statmath.wu.ac.at/research/talks/resources/PresIRT.pdf
>
> Mike L.
>
> On 8/14/2013 0:52 AM, fatemeh khalesi wrote:
> > My problem is assessment test-takers based on item response theory
> > model and i don't know how it's estimate discrimination parameter (a)
> > and ranking students.
> >
>
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-- 
Sincerely
    F.K
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