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Hierarchical Factoring in a Standardized Achievement Battery.
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Martin, David J.; Dunbar, Stephen B. – Educational and Psychological Measurement, 1985
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…
Descriptors: Achievement Tests, Factor Analysis, Factor Structure, Intermediate Grades
The Reliability and Validity of Writing Assessment: An Investigation of Rater, Prompt within Mode, and Prompt between Mode Sources of Error.
Cantor, Nancy K.; Hoover, H. D. – 1986
This paper isolates and examines separately three distinct sources of error in essay scores: lack of agreement between raters; inconsistencies in performance within mode of discourse, and inconsistencies in performance between modes of discourse. Essay prompts in the Iowa Tests of Basic Skills (ITBS) Writing Supplement were designed to assess…
Descriptors: Academic Achievement, Cues, Elementary Secondary Education, Error of Measurement
An Exploratory Study of Group Differences in the Performance of Pupils in Grades 6, 7, 8, and 9 on the Items in the Iowa Tests of Basic Skills.
Coffman, William E. – 1978
The Iowa Tests of Basic Skills were administered to over 600 black and white students in grades six through nine, to determine if the test showed bias against minorities. Outliers were identified from test results. Outliers are items which differ from the central core of test items because they fall outside the range expected from a random…
Descriptors: Achievement Tests, Basic Skills, Black Students, Comparative Testing