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 examinee 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.