The study compared the relationships of more easily administered intelligence screening instruments with the Wechsler Intelligence Scale for Children (WISC) to determine the validity of the Peabody Picture Vocabulary Test, the Slosson Intelligence Test, and the Raven Progressive Matrices among reading disabled children. The screening measures were…

One hundred eighty one sets of black twins and 223 sets of white twins provided responses to four 12-item subtests of the Raven's Progressive Matrices Test, Standard Version. The children were in elementary school and their item response patterns were analyzed with the use of revised ordering-theoretic methods to search for best-fitting…

Item components that might contribute to the difficulty of items on the Raven Colored Progressive Matrices (CPM) and the Standard Progressive Matrices (SPM) were studied. Subjects providing responses to CPM items were 269 children aged 2 years 9 months to 11 years 8 months, most of whom were referred for testing as potentially gifted. A second…