Es. Hishinuma et S. Tadaki, THE PROBLEM WITH GRADE AND AGE EQUIVALENTS - WIAT AS A CASE IN POINT, Journal of psychoeducational assessment, 15(3), 1997, pp. 214-225
Problems associated with grade equivalents (GEs) and age equivalents (
AEs) have been noted in the past This study investigated the counterin
tuitive observation that a student entering first grade can obtain a s
tandard score of 99 on the Wechsler Individual Achievement Test (WIAT)
and obtain a grade equivalency approximately one-half grade behind ac
tual grade placement. The present study confined this derived-score-di
screpancy phenomenon to the following WIAT subtests and regions: (a) B
asic Reading-primary grades; (b) Mathematics Reasoning-primary grades;
and (c) Oral Expression-intermediate and high school grades and ages.
Recommendations are offered to practitioners in light of the findings
.