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A Computer Program for Simulation Evaluation of IRT Ability Estimators IRT

Rubin, David; Thissen, David; Wainer, Howard
Publication Year:
Report Number:
RR-84-37, PSRTR-84-50
ETS Research Report
Document Type:
Page Count:
Subject/Key Words:
United States Air Force Human Resources Laboratory, Computer Software, Estimation (Mathematics), Item Analysis, Item Response Theory (IRT), Program Evaluation, Simulation, Statistical Analysis


This report documents a computer program for simulation evaluation of item response theory (IRT) ability estimators. This Honeywell DPS version is a very slight modification of the program originally developed in FORTRAN-77 on a DEC VAX 11/780. The model of the world simulated by the program involves a unidimensional test in which the probability of a correct response is given by a trace line on a single dimension (ability). The appendices contain: (1) the program; (2) a sample of its main output file using four items and 100 simulated examinees at each of five ability levels; and (3) a program to graph the robust simulation results. (AUTHOR/BS). (91pp.)

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