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

fatemeh khalesi fakhalesi at gmail.com
Wed Aug 14 06:29:13 EST 2013


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 .

Best Regards,
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