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Comparing Classical and Item-Response Theory

When a new test is developed, test developers typically begin by creating more items than are needed. Item analysis techniques such as CTT and IRT are then used.

Provide an explanation of advantages and disadvantages of CTT and IRT.

Describe two specific circumstances for which IRT might provide meaningful benefits if applied to the development or implementation of the test that you are proposing for children with behavioral problems using intelligence tests and explain why.

Describe two specific circumstances for which CTT might provide meaningful benefits to your test and explain why.

Solution Preview

Dear student,

Hi and thank you for using Brainmass. The task being asked of you is pretty straightforward. You are to compare classical theory and item-response theory, but in particular, exemplifying 2 instances where IRT will be useful and the same goes for CTT. This means that you need not define CTT and IRT as it is already a given that you are supposed to know them, all you need to do is show by example. Once again, this will be straightforward. I suggest an outline like this:

1. Introduction - on IRT & CTT
2. IRT - two examples
3. CTT - two examples

You don't need more than this, as long as you provide concise ideas and reference your resource. Good luck with your studies.

Sincerely,
AE 105878/Xenia Jones

On IRT & CTT

Item response theory (IRT) & classical test theory (CTT) are the two popular statistical frameworks used to address measurement problems in the likes of developmental tests, test-score equating and in testing for biased test items (Hambleton & Jones, 1993). CTT predicts outcomes of psychological testing like test difficulty as well as test-taker ability by assuming that a person has a true score that can be obtained if there are no measurement errors. The equation is such: Observed ...

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