A Note on the Identifiability of Fixed-Effect 3PL Models

Hao Wu ()
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Hao Wu: Boston College

Psychometrika, 2016, vol. 81, issue 4, No 9, 1093-1097

Abstract: Abstract In this note, we prove that the 3 parameter logistic model with fixed-effect abilities is identified only up to a linear transformation of the ability scale under mild regularity conditions, contrary to the claims in Theorem 2 of San Martín et al. (Psychometrika, 80(2):450–467, 2015a).

Keywords: item response theory; 3PL model; identification (search for similar items in EconPapers)
Date: 2016
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Citations: View citations in EconPapers (2)

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DOI: 10.1007/s11336-016-9519-8

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