In a 504-dataset IRT corpus, flexible latent-density estimates departed from normality by at least 10 cumulative probability points in 56% of fits.
and Thissen, David , title =
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How Common Are Estimated Latent-Distribution Departures From Normality? Evidence From 504 Item-Response Data Sets
In a 504-dataset IRT corpus, flexible latent-density estimates departed from normality by at least 10 cumulative probability points in 56% of fits.