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50 Years of ERIC
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Peer reviewed Peer reviewed
ERIC Number: EJ249410
Record Type: CIJE
Publication Date: 1981
Pages: N/A
Abstractor: N/A
Reference Count: 0
ISBN: N/A
ISSN: N/A
The Relative Difficulty Ratio-A Test and Item Index.
Frisbie, David A.
Educational and Psychological Measurement, v41 n2 p333-39 Sum 1981
The Relative Difficulty Ratio (RDR) was developed as an index of test or item difficulty for use when raw score means or item p-values are not directly comparable because of chance score differences. Computational RDR are described. Applications of the RDR at both the test and item level are illustrated. (Author/BW)
Descriptors: Difficulty Level, Item Analysis, Mathematical Formulas, Test Items
Publication Type: Journal Articles; Reports - Evaluative
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers: Relative Difficulty Ratio