Concurrent Validity of the Wisc-Iii and Stanford-Binet Iv
WISC-III and Stanford-Binet IV IQs were correlated for 57 volunteers (27 boys and 30 girls of ages 6 to 17 years) who were tested by 37 graduate students. Order of testing was not counterbalanced. Full Scale IQs on the WISC-III correlated .81 with the Test Composite Standard Age Scores of the Stanford-Binet IV. The average difference between the two tests was less than 2 IQ points. Although the average difference between the two tests was not significant, for some children it was large. Caution is urged when using these assessment instruments as if they provide similar scores.