A Statistical Perspective on Equating Test Scores

  • Alina A. von Davier
Part of the Statistics for Social and Behavioral Sciences book series (SSBS)


The comparability of scores across different test forms of a standardized assessment has been a major focus of educational measurement and the testing industry for the past 90 years (see Holland, 2007, for a history of linking). This chapter focuses on the statistical methods available for equating test forms from standardized educational assessments that report scores at the individual level (see also Dorans, Moses, & Eignor, Chapter 2 of this volume).


Item Response Theory Test Form Test Taker Item Response Theory Model Bifactor Model 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Author Note:

Many thanks go to my colleagues Paul Holland, Jim Carlson, Shelby Haberman, Dan Eignor, Dianne Henderson-Montero, and Kim Fryer for their detailed reviews and comments on the material that led to this chapter. Any opinions expressed in this chapter are those of the author and not necessarily of Educational Testing Service.

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.Educational Testing ServicePrincetonUSA

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