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The lz* statistic (Snijders, 2001) was recently extended to polytomous items. This paper points the readers to an R program that can be used to do compute lz* for polytomous items.
This page is a summary of: lzstarMix, Applied Psychological Measurement, August 2015, SAGE Publications,
DOI: 10.1177/0146621615599078.
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