EVALUATING PREDICTIVE-VALIDITY BY USING DIFFERENT SCALES OF THE STANFORD ACHIEVEMENT-TEST FOR THE HEARING-IMPAIRED

It has been suggested that percentile ranks on the subtests of Stanfor d Achievement Test for the Hearing Impaired yield stronger predictive validity coefficients for the Performance Scale of the Wechsler Intell igence Scale for Children (Revised). This issue of the best criterion scale was re-examined in this study. The predictive validities were ev aluated in relation to the two scales of six SAT-HI subtests and three sample sizes. Contrary to previous suggestions, the results indicated that scaled scores of SAT-HI subtests should be used in predictive va lidity investigations. Scaled scores were found to be consistent and e fficient; that is, the validity coefficients approached the true coeff icients with increasing sample size.