Abstract
The latest revision of the Iowa Tests of Basic Skills (ITBS), Forms 7 and 8, consists of 11 subtests, nine of which are combined to yield three subtotal scores and one composite score. As part of one school district's testing program, the ITBS was administered to one group of beginning fourth grade students and one group of beginning eighth grade students. A factor analysis was performed for each of the two groups on Levels 10 and 14 of the ITBS. The intercorrelations provided by the 1977 fourth and eighth grade national standardization sample for these same levels were also factor analyzed. Results of all the analyses showed that there was essentially one common factor with little evidence that the user would gain much non-redundant information from the 15 scores yielded by the ITBS.
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