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Peer reviewed Peer reviewed
ERIC Number: EJ226693
Record Type: CIJE
Publication Date: 1979
Pages: N/A
Abstractor: N/A
Reference Count: 0
ISBN: N/A
ISSN: N/A
Relationships between the Item Difficulty and Discrimination Indexes.
Aiken, Lewis R.
Educational and Psychological Measurement, v39 n4 p821-24 Win 1979
The dependence of item discrimination index (D) on item difficulty index (p), and the relationship of D and p to the phi coefficient are delineated. A table of critical values of D significant at the .10 and .05 levels, with p ranging from .10 to .90, is presented. (Author/CTM)
Descriptors: Correlation, Item Analysis, Statistical Significance, Tables (Data)
Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers: Item Difficulty; Item Discrimination (Tests)