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Reliability of Scaled Scores IRT

Author(s):
Haberman, Shelby J.
Publication Year:
2008
Report Number:
RR-08-70
Source:
ETS Research Report
Document Type:
Report
Page Count:
9
Subject/Key Words:
Item Response Theory (IRT), Variance, Item Sets, Partial Credit Model, Two-Parameter Logistic Model, Reliability

Abstract

The reliability of a scaled score can be computed by use of item response theory. Estimated reliability can be obtained even if the item response model selected is not valid.

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