Additional file 1.
Appendix A. Generating and Estimated Item Parameters for the Two Simulated Item Banks (Validation data) Based on the One-and Two-Parameter IRT Models, Respectively. 1PL = one-parameter item response model; 2PL = two-parameter item response model; α = simulated discrimination parameter; β = simulated difficulty parameter; = estimated discrimination parameter; = estimated difficulty parameter.
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Riley and Carle BMC Medical Research Methodology 2012 12:124 doi:10.1186/1471-2288-12-124