MartÃn, Ernesto San; Rolin, Jean-Marie; Castro, Luis - In: Psychometrika 78 (2013) 2, pp. 341-379
In this paper, we study the identification of a particular case of the 3PL model, namely when the discrimination parameters are all constant and equal to 1. We term this model, 1PL-G model. The identification analysis is performed under three different specifications. The first specification...