[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.

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

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 .

Rasch mailing list
Rasch at acer.edu.au<mailto:Rasch at acer.edu.au>
Unsubscribe: https://mailinglist.acer.edu.au/mailman/options/rasch/fakhalesi%40gmail.com

Rasch mailing list
Rasch at acer.edu.au<mailto:Rasch at acer.edu.au>
Unsubscribe: https://mailinglist.acer.edu.au/mailman/options/rasch/trevor.bond%40jcu.edu.au
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://mailinglist.acer.edu.au/pipermail/rasch/attachments/20130814/55c56d7e/attachment.html 

More information about the Rasch mailing list