Chapter 1: Should Nonlinear Functions of Test Scores Be Used as Covariates in a Regression Model?

This material is based on work supported by the U.S. Department of Education Institute of Education Sciences under Grant No. R305D090011. Any opinions, findings and conclusions, or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of these organizations. At the time of publication, the authors were employed by Educational Testing Service, but the work was not conducted by Educational Testing Service and the document did not undergo Educational Testing Service review.