skip to main content skip to footer

Scale Drift In On-Line Calibration CAT

Stocking, Martha L.
Publication Year:
Report Number:
ETS Research Report
Document Type:
Page Count:
Subject/Key Words:
Office of Naval Research, Adaptive Testing, Computer Assisted Testing, Item Response Theory (IRT), LOGIST, Scaling, Testing Problems


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. (134pp.)

Read More