[Rasch] Some questions in estimating item parameters!

Nguyen Thi Tham thamnt at vnu.edu.vn
Fri Dec 23 21:27:32 EST 2005

Hi all,
I am a new mailling list member. I have just read some papers on Item Response Theory (IRT) and Rasch.
I want to estimate the item parameters (discrimination, difficulty, guessing) for all questions in the item bank (or item pool). 
Could you help me answer the following questions?
1) How to estimate the item parameters? 

2) What is a maximal likelihood method?

3) Is there any free software or shareware helping me to estimate?

Thanks a lot.

Merry Christmas & Happy New Year!

Nguyen Thi Tham
Vietnam National University, Hanoi
email: thamnt at vnu.edu.vn 
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