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

Mike Linacre mike at winsteps.com
Wed Aug 14 07:58:01 EST 2013

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 .

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