Estimating Item Characteristics Curves.
Final rept. Mar-Sep 78,
AIR FORCE HUMAN RESOURCES LAB BROOKS AFB TEX
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A simulation study of the effectiveness of the following four item characteristic curve estimation programs was conducted ANCILLES, OGIVIA from U. S. Civil Service Commission LOGIST from Educational Testing Service and simple transformations to the item-test biserial correlation. Using the three-parameter logistic model, three groups of 2,000 simulated subjects were administered 80-item tests. These simulated item responses were then calibrated using the four programs. The estimated item parameters were compared to the known item parameters in four analyses for each program in all of the three data sets. It was concluded that the selection of an item calibration procedure should be dependent on the distribution of ability in the calibration sample, the planned uses of the item parameters, and the computer resources available. Author
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