ERIC Number: EJ226693
Record Type: Journal
Publication Date: 1979
Reference Count: 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)
Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Authoring Institution: N/A