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May, Kim; Jackson, Tameika S. – International Journal of Testing, 2005
The effect of different combinations of item response theory (IRT) item parameters (item difficulty, item discrimination, and the guessing probability) on the reliability and construct validity (correlation with the latent trait being measured) of pretest, posttest, and gain scores was analytically examined using the 3-parameter logistic (3PL)…
Descriptors: Pretests Posttests, Guessing (Tests), Probability, Scores