"1. GEs (Grade Equivalents) within the intended grade range of a test level or of one level above or below it are relatively meaningful; they are based on scores of students who took a test with similar content….

2. As GEs extend beyond the intended grade range of a test level and the levels immediately above and below it, their grade-level associations become increasingly less meaningful….

3. GEs, like PRs (Percentile Ranks) do not represent equal units of reading achievement"…. P. 21

Manual For Scoring And Interpretation, Third Edition, Level 5/6. Riverside Publishing Company, 8420 Bryn Mawr Avenue, Chicago, IL 60631. (630) 467-7000. www.riverpub.com;
 
 

Wide Range Achievement Test

…. "By defining the mean performance of a sample of individuals from a particular grade level, one can determine whether an individual scores higher or lower than this average performance. By obtaining the mean performance of a sequence of grades from kindergarten to 12th grade, a scale can be constructed to show the relative performance of an individual. These scores are still ordinal in nature and should be used cautiously when interpreting test results. It is not appropriate to add or subtract grade scores because the distance between points on the scale is not equal. Averages of grade scores are not appropriate."…. P.33

Administration Manual, WRAT3. Wide Range, Inc., 15 Ashley Place, Suite 1A, Wilmington, Deleware 19804-1314. (302) 652-4990.