Which of the following is NOT an assumption attendant to the use of IRT?
A) the assumption of unidimensionality
B) the assumption of heteroskedacity
C) the assumption of local independence
D) the assumption of monotonicity

Question

Quizplus · Accepted Answer

The assumption of heteroskedacity is not applicable to IRT as it pertains to regression analysis. The other options, unidimensionality, local independence, and monotonicity, are all assumptions that must be met when using IRT. Unidimensionality assumes that all the items within the test or scale are measuring the same underlying construct; local independence assumes that the responses to each item are independent of one another; and monotonicity assumes that the probability of answering an item correctly increases as the underlying construct being measured increases.

Which of the Following Is NOT an Assumption Attendant to the Use