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For ordinal rating data, consider the accelerated EM algorithm to estimate and test models within the family of CUB models (where CUB stands for Combination of a discrete Uniform and a shifted Binomial distributions). The procedure is built upon Louis' identity for the observed information matrix. Bestsubset variable selection is then implemented since it becomes more feasible from the computational point of view.
Package details 


Author  Rosaria Simone [aut, cre] 
Maintainer  Rosaria Simone <rosaria.simone@unina.it> 
License  GPL2  GPL3 
Version  0.0.3 
Package repository  View on CRAN 
Installation 
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