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Download full textMislevy, Robert J. – 1992
A closed form approximation is given for the variance of examinee proficiency estimates in the Rasch model for dichotomous items, under the condition that only estimates, rather than true values, of item difficulty parameters are available. The term that must be added to the usual response-sampling variance is inversely proportional to both the…
Descriptors: Academic Achievement, Achievement Tests, Equations (Mathematics), Estimation (Mathematics)
