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

Bond, Trevor trevor.bond at jcu.edu.au
Wed Aug 14 19:02:30 EST 2013


Fatemeh Khalesi,
My guess is that you need to read about the '2 parameter IRT' model. That is quite a bit different from what this list is about. Please use that as a search item in Google Scholar, or for web searches. You will find plenty about it.
Regards
TGB

Sent from 007's iPad

On 14/08/2013, at 8:53 AM, "fatemeh khalesi" <fakhalesi at gmail.com<mailto:fakhalesi at gmail.com>> wrote:

It was too helpful, Thanks a lot.
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.
please help me to find out, If it's possible .

Best Regards,



On Wed, Aug 14, 2013 at 2:28 AM, Mike Linacre <mike at winsteps.com<mailto:mike at winsteps.com>> wrote:
Fatemeh Khalesi, there are many ways to estimate ability and difficulty.
Here is one: Mark Moulton's Excel spreadsheet - linked from
www.rasch.org/moulton.htm<http://www.rasch.org/moulton.htm>

Mike L.

On 8/13/2013 13:29 PM, fatemeh khalesi wrote:
> Hello,
>
> I am reading THE BASICS OF ITEM RESPONSE THEORY  article and i don't
> know how it's calculate  ability estimation and difficulty in  table
> 7-4 and 7-3.
> Please help me to find out .

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--
Sincerely
    F.K
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