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Abstract
This study compared the reliability and validity of two different measures of reading ability, the Degrees of Reading Power (DRP) and the Iowa Tests of Basic Skills (ITBS) Reading Comprehension test and the ITBS Vocabulary test. The data consisted of scores of 377 grade 5 and 6 students on these tests, assigned reading levels, and teacher-assigned grades. Intercorrelations, including disattenuated values, were the primary method of data analysis. The differences between the ITBS and DRP on the reliability and validity evidence presented were minor and appeared to be of limited practical significance.
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