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An Empirical Investigation of Methods for Assessing Item Fit for Mixed Format Tests
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Chon, Kyong Hee; Lee, Won-Chan; Ansley, Timothy N. – Applied Measurement in Education, 2013
Empirical information regarding performance of model-fit procedures has been a persistent need in measurement practice. Statistical procedures for evaluating item fit were applied to real test examples that consist of both dichotomously and polytomously scored items. The item fit statistics used in this study included the PARSCALE's G[squared],…
Descriptors: Test Format, Test Items, Item Analysis, Goodness of Fit
Estimating the Internal Consistency Reliability of Tests Composed of Testlets Varying in Length.
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Feldt, Leonard S. – Applied Measurement in Education, 2002
Considers the degree of bias in testlet-based alpha (internal consistency reliability) through hypothetical examples and real test data from four tests of the Iowa Tests of Basic Skills. Presents a simple formula for computing a testlet-based congeneric coefficient. (SLD)
Descriptors: Estimation (Mathematics), Reliability, Statistical Bias, Test Format
The Effect of Extended Time Limits on Learning Disabled Students' Scores on Standardized Reading Tests.
Perlman, Carole; And Others – 1996
Eighty-five fourth- and eighth-grade learning disabled students whose individualized education plans specified untimed achievement testing were tested with the Reading Comprehension subtest of the Iowa Tests of Basic Skills, either according to the publisher's 40-minute time limit or with an extended time limit of 2 hours, 30 minutes. Results were…
Descriptors: Achievement Tests, Elementary Education, Elementary School Students, Grade 4