Concerning The Identification Of The 3PL Model
Door: Maris, G.K.J. | 23-11-2002 It is shown that the parameters of the Three Parameter Logistic model are not identifiable.This is shown for the special case when the item discrimination parameters of all items are equal. The form of non-identifiability considered here differs from the well-known location and scale non-identifiability of the parameters of the Three Parameter Logistic model. The crucial property of the present of non-identifiability
is that it also involves the, so-called, guessing parameters.
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