Scale Drift in On-Line Calibration

Abstract
Recent advances in psychometrics and computer technology encourage the development of model-based methods of individualized testing on a microcomputer, where each examines receives short tests and the number of pretest items that can be administered is severely restricted. On-line (i.e., data is collected on operational equipment) methods for calibrating pretest items in this setting face new challenges. In the context of adaptive testing, two LOGIST-based methods of on-line calibration were developed and are described. These two methods are tried out and compared in a simulation study using data for the CAT-ASVAB.

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