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Direct linkKolen, Michael J.; Wang, Tianyou; Lee, Won-Chan – International Journal of Testing, 2012
Composite scores are often formed from test scores on educational achievement test batteries to provide a single index of achievement over two or more content areas or two or more item types on that test. Composite scores are subject to measurement error, and as with scores on individual tests, the amount of error variability typically depends on…
Descriptors: Mathematics Tests, Achievement Tests, College Entrance Examinations, Error of Measurement
Download full textKolen, Michael J.; Hoover, H. D. – 1982
The reliabilities of 6 item bias indices and correlations among them were investigated for each of the 11 tests of the Iowa Tests of Basic Skills (ITBS). The difficulty and delta indices detected group differences in relative item difficulty. Biserial and point biserial indices detected group differences in item discrimination. The Scheuneman and…
Descriptors: Achievement Tests, Black Students, Elementary School Students, Females
