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Nandakumar, R. & Hotchkiss, L. (2012). PROC NLMIXED: For Estimating Parameters of IRT Models. Applied Psychological Measurement, 36(1), 60-63.
You are about to send the following abstract:
Nandakumar, R. & Hotchkiss, L. (2012). PROC NLMIXED: For Estimating Parameters of IRT Models. Applied Psychological Measurement, 36(1), 60-63.