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Missing Responses in Item Response Modeling

Authored by: Robert J. Mislevy

Handbook of Item Response Theory Volume Two Statistical Tools

Print publication date:  February  2016
Online publication date:  March  2017

Print ISBN: 9781466514324
eBook ISBN: 9781315373645
Adobe ISBN:

10.1201/b19166-13

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Abstract

Missing responses occur in item response theory (IRT) applications in ways that may or may not have been intended by the examiner and may or may not be related to people’s ability ?. The mechanisms that produce missingness must be taken into account to draw correct inferences. This chapter addresses missingness in IRT through the lens of Rubin’s (1976, 1977) missing-data framework. Implications for Bayesian and likelihood estimation are discussed for (a) random assignment of items, including alternate test forms and matrix sampling, (b) targeted testing, including vertical linking, (c) adaptive testing, (d) not-reached items, (e) intentional omits, and (f) examinee choice of items.

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