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Samejima, Fumiko

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Plausibility Functions of Iowa Vocabulary Test Items Estimated by the Simple Sum Procedure of the Conditional P.D.F. Approach.

Samejima, Fumiko – 1984

Simple sum procedure of the conditional PDF approach (plausiblity of distractor function) combined with the normal approach method was applied for estimating the plausibility functions of the distractors of the Level II vocabulary subtest items of the Iowa Tests of Basic Skills. In so doing, the normal ogive model was adopted for the correct…

Descriptors: Adaptive Testing, Elementary Secondary Education, Estimation (Mathematics), Item Analysis

Modifications of the Test Information Function.

Samejima, Fumiko – 1990

Two modification formulas are presented for the test information function in order to provide better measures of local accuracies of the estimation of "theta" when maximum likelihood estimation is used to provide the estimate of ability "theta." A minimum bound of any estimator, biased or unbiased, is considered; and Formula 1…

Descriptors: Ability Identification, Adaptive Testing, Computer Assisted Testing, Elementary Secondary Education