Search results for author:"J O. Ramsay"
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Psychometrika Vol. 56, No. 4 (1991) pp. 611–30
Kernel smoothing methods for nonparametric item characteristic curve estimation are reviewed. A simulation with 500 examinees and real data from 3,000 records of the Graduate Record Examination illustrate the rapidity of kernel smoothing. Even when...
Psychometrika Vol. 56, No. 3 (1991) pp. 365–79
A method is presented for estimating the item characteristic curve (ICC) using polynomial regression splines. Estimation of spline ICCs is described by maximizing the marginal likelihood formed by integrating ability over a beta prior distribution....