The normative sample for the Leiter-R included 1,719 typical children and adolescents and 692 atypical children (representing 9 clinical groups) between the ages of 2 and 20. The sample was drawn from major regions of the United States, and had nationally-representative proportions of several ethnicities—Caucasian, African-American, Hispanic-American, Asian-American, and Native American. The sample for the Leiter-R is representative of the U.S. population regarding child's age, gender, and socio-economic status.
The Manual is extensive including internal consistency, test-retest and decision-consistency reliability. Also included are test information curves and item-bias studies based on Item-Response Theory. Internal consistency reliability ranges between .88 and .93.
Validity Research studies on construct, content and criterion validity are described in an extensive validity chapter in the test manual. Confirmatory factor analysis has shown Leiter-R to fit a hierarchical "g" model of cognitive abilities, including nonverbal reasoning, visualization, memory and attention facets. Studies of criterion groups such as children with giftedness or cognitive delay, show significant differences, in the expected direction, from children in the normative sample. Research with several concurrent measures provides excellent validity information.
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Gale H. Roid, Ph.D.
Dr. Roid is Lloyd Dunn Professor of Educational and Psychological Assessment at the Peabody College of Vanderbil University in Nashville, Tennessee. He is the author or the co-author of six published tests including the SB5 and the Leiter International Performance Scale–Revised.
Dr. Roid received his B.A. from Harvard University and his M.A. and Ph.D. from the University of Oregon. He is a Fellow of APA, Division 5, and also a Diplomate of the American Board of Assessment Psychology.
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