The CAS standardization sample was a representative group of 2,200 children and adolescents 5.0 through 17.11 years of age. A stratified random sampling plan was used to obtain a sample that closely matched the U.S. population. There were 68 sites and 240 examiners involved in the standardization. Norms are reported in 4-month intervals.
To develop an ability-achievement discrepancy procedure, 1,600 students included in the CAS standardization group were administered the WJ-R® Tests of Achievement.
Reliability and Validity
Extensive reliability and validity information is reported in the Interpretive Handbook that accompanies the test. Full Scale reliability is .96 with the PASS Scale reliabilities ranging from .83 to .93. Internal consistency and test-retest reliability studies were conducted. Types of validity reported include construct, concurrent, predictive, and discriminant.
Validity with special populations including persons who are mentally retarded, learning disabled, gifted, or have attention deficits or traumatic brain injuries are reported. Differences in PASS Scales performance were found for these groups, supporting the discriminant validity of the CAS.
Special attention was paid to making the CAS fair for minority groups. Validity evidence reported in the Interpretive Handbook demonstrates the test's value for assessment of diverse groups of children.Back to the top
Jack A. Naglieri, Ph.D.
Dr. Jack A. Naglieri is Professor of Psychology. Prior to his current position he was Professor of School Psychology and Psychology at the Ohio State University where he taught from 1982 to 2000. He also is a Fellow of APA Division 16, recipient of APA Division 16 2001 Senior Scientist Award, and holds an appointment as a senior Research Scientist at the Devereux Foundation's Institute for Clinical Training and Research. Dr. Naglieri obtained his Bachelor's degree in Psychology from Long Island University, Master of Science from St. John's University, and Ph.D. in Educational Psychology from the University of Georgia in 1979. He worked as a school psychologist in the New York area from 1974-1977.
The author of more than 150 scholarly papers, chapters, books, and tests, he has focused his efforts since the late 1970s on reconceptualizing intelligence. Jack A. Naglieri is also the author of the Cognitive Assessment System (Naglieri & Das, 1997), the CAS Scoring Aide (Naglieri, 2002), the General Ability Measure for Adults (Naglieri & Bardos, 1997), Naglieri Nonverbal Ability Test (Naglieri, 1996), Devereux Scoring Assistant (LeBuffe, Naglieri, & Pfeiffer, 1996), Devereux Scales of Mental Disorders (Naglieri, LeBuffe, & Pfeiffer, 1994), Devereux Behavior Rating Scales School Form (Naglieri, LeBuffe, & Pfeiffer, 1994), Draw A Person: Screening Procedure for Emotional Disturbance (Naglieri, McNeish, & Bardos, 1990), Draw A Person: Quantitative Scoring System (Naglieri, 1988), Matrix Analogies Test (Naglieri, 1985).
Back to the top