American Journal of Economics and Business Administration

A Primer on the One-Parameter Rasch Model

Randy McCamey

DOI : 10.3844/ajebasp.2014.159.163

American Journal of Economics and Business Administration

Volume 6, Issue 4

Pages 159-163


The Rasch measurement model improves on traditional test construction by creating tests in which the person’s ability is independent of the sample of items used and the norm group used to calibrate the test. This article is an introductory review of the Rasch Model and describes properties of the Item Characteristic Curve (ICC) and discusses the utility of having person ability and item difficulty on a common scale.


© 2014 Randy McCamey. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.