Relationships between the Item Difficulty and Discrimination Indexes.

Aiken, Lewis R.

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Peer reviewed

ERIC Number: EJ226693

Record Type: Journal

Publication Date: 1979

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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

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