The usefulness of the Structure of Intellect Learning Abilities Test for predicting reading and arithmetic achievement of elementary school pupils as measured by the Iowa Tests of Basic Skills was investigated using regression analyses. The Structure of Intellect test performed generally as predicted. (Author/JKS)

The predictive validity of the California Achievement Test, Reading (CAT-R) was examined for 480 Hispanic and Anglo pupils in Grades 2 and 3. The validity of the CAT-R as a predictor for reading for combined groups of Hispanic and Anglo pupils appeared to be limited. (Author/LMO)

The factorial validity of the Iowa Tests of Basic Skills was investigated. Hierarchical factor analysis was performed with a subset of the standardization data to explore the presence of second-order group factors. Results supported the construct validity of Language and Mathematics subscales. Verbal and Visual Information group factors were…

This study compared the validity of chronological age, a standardized algebra prognosis test, standardized verbal and quantitative scales derived from an achievement test battery, and an objective measure of formal or concrete stages of Piagetian cognitive development for predicting final examination scores and course grades in high school…

Correlations between the achievement test scores of 2,000 entering freshmen in 1977 and measures of college performance were similar to those reported for tests of the college entrance type. These results provide support for the predictive validity of the Iowa Tests of Basic Skills and the Iowa Tests of Educational Development achievement test…

A factor analysis was performed for two levels of the Iowa Tests of Basic Skills (ITBS). Results showed that there was essentially one common factor with little evidence that the user would gain much nonredundant information from the 15 scores yielded by the ITBS. (Author/GK)

This study investigated the relationship between achievement test scores on the Iowa Tests of Basic Skills (ITBS) and Iowa Tests of Educational Development (ITED), and high school and college grade point average. Support for the predictive validity of the ITBS and ITED achievement test batteries is provided. (Author/GK)

In a study involving 1,147 college freshmen, significant relationships were found between elementary and secondary school achievement test scores on the Iowa Test of Basic Skills (ITBS) and the Iowa Tests of Educational Development (ITED) and high school and college grade point average, but the magnitude of these relationships was small. (SLD)

Examined the incidence of differential item functioning (DIF) on 3 subtests of the Iowa Tests of Basic Skills using test scores for 2,867 Alaskan students, characterized as "Native" or White at fourth and sixth grades or sixth and eighth grades. Effect size differences favoring whites were larger when students of equal English…