Showing 1 - 2 of 2 Research Library Publications

Quantifying the Bias of Non-linear Equating and Score Transformations

Posted: | Matthias von Davier, Brian Clauser

Essays on Contemporary Psychometrics: Pages 163-180

 

This paper shows that using non-linear functions for equating and score transformations leads to consequences that are not commensurable with classical test theory (CTT). More specifically, a well-known theorem from calculus shows that the expected value of a non-linearly transformed variable does not equal the transformed expected value of this variable.

Category:Assessment-Oriented Research, Scoring

A Comparison of Experimental and Observational Approaches to Assessing the Effects of Time Constraints in a Medical Licensing Examination

Posted: | P. Harik, B. E. Clauser, I. Grabovsky, P. Baldwin, M. Margolis, D. Bucak, M. Jodoin, W. Walsh, S. Haist

Journal of Educational Measurement: Volume 55, Issue 2, Pages 308-327

 

The widespread move to computerized test delivery has led to the development of new approaches to evaluating how examinees use testing time and to new metrics designed to provide evidence about the extent to which time limits impact performance. Much of the existing research is based on these types of observational metrics; relatively few studies use randomized experiments to evaluate the impact time limits on scores. Of those studies that do report on randomized experiments, none directly compare the experimental results to evidence from observational metrics to evaluate the extent to which these metrics are able to sensitively identify conditions in which time constraints actually impact scores. The present study provides such evidence based on data from a medical licensing examination.

Category:Assessment-Oriented Research, Reliability/Validity, Scoring, Product-Oriented Research, USMLE