A Note on the Identifiability of Fixed-Effect 3PL Models |
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Authors: | Hao Wu |
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Institution: | 1.Department of Psychology,Boston College,Chestnut Hill,USA |
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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). |
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