On the identifiability of a mixture model for ordinal data

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Hierarchical CUB Models for Ordinal Variables (2012, background): “Such random variable is well defined if ∈ 0 1 and ∈ 0 1 , and a cub model has been proved identifiable for any m > 3 (Iannario, 2010).”
The importance of wine attributes for purchase decisions: A study of Italian consumers’ perception (2013, background): “In particular, Iannario (2010, 2012) showed that such a model is statistically identifiable and improved its formulation to include shelter choices.”