Statistical approaches to the study of item difficulty
By: John F. Olson, Janice Scheuneman, Angela Grima
Contributors: Scheuneman, Janice; Grima, Angela
Series: RR -- 89-21; Research report (Educational Testing Service) -- RR-89-21
Publisher: Educational Testing Service
Published: 1989
Place of publication: Princeton, N.J
Language: eng
Number of pages: 30
Subjects: Examinations; Interpretation
Notes: "August 1989."

Includes bibliographical references (p. 26-30).