Search results for author:"Lawrence Hotchkiss"
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PROC NLMIXED: For Estimating Parameters of IRT Models
Ratna Nandakumar; Lawrence Hotchkiss
Applied Psychological Measurement Vol. 36, No. 1 (January 2012) pp. 60–63
The PROC NLMIXED procedure in Statistical Analysis System can be used to estimate parameters of item response theory (IRT) models. The data for this procedure are set up in a particular format called the "long format." The long format takes a...