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COMMENT
JOURNAL ARTICLE
A Note on the Identifiability of Fixed-Effect 3PL Models.
Psychometrika 2016 December
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).
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