[Rasch] CAT Questions

Mike Linacre (RMT) rmt at rasch.org
Thu Jan 28 16:11:21 EST 2010

Thank you for asking us, Ranganaths.

You asked:
>1. I am wondering how the IRT in its computer application version called 
>CAT useful in accessing a student?.

Answer: CAT is useful and effective. Each student can have a customized 
test with increased security and flexible test scheduling. relative to 
paper-and-pencil tests.

You asked:
>2. What question types are used for CAT?

Reply: Any type that can be computer-scored. Multiple-choice questions are 
the most common.

You asked:
>3. Which of the 3 models 1P, 2P and 3P is useful for a correct judgment of 
>the student's ability?

Reply: In practice, 1P (Rasch) is the most practical model for item 
selection and ability estimation for items scored right/wrong.

You asked:
>4. Which book is best suited to know the advanced form of IRT for the real 
>application of it?

Reply: You could start with a Google search of www.rasch.org for documents 
explaining basic CAT concepts. Then Google-search the Internet for 
documents and books relating to more complex topics, such as CAT test 
security and CAT item exposure.

Mike L.

Mike Linacre
Editor, Rasch Measurement Transactions
rmt at rasch.org www.rasch.org/rmt/ Latest RMT:  23:2 Autumn 2009

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