Some Relationships between the Binomial Error Model and Classical Test Theory.

Feldt, Leonard S.

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ERIC Number: EJ309353

Record Type: Journal

Publication Date: 1984

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Some Relationships between the Binomial Error Model and Classical Test Theory.

Feldt, Leonard S.

Educational and Psychological Measurement, v44 n4 p883-91 Win 1984

The binomial error model includes form-to-form difficulty differences as error variance and leads to Ruder-Richardson formula 21 as an estimate of reliability. If the form-to-form component is removed from the estimate of error variance, the binomial model leads to KR 20 as the reliability estimate. (Author/BW)

Descriptors: Achievement Tests, Difficulty Level, Error of Measurement, Mathematical Formulas, Mathematical Models, Test Items, Test Reliability, Test Theory

Publication Type: Journal Articles; Reports - Research

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Language: English

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