DIFferential testlet functioning
Subtitle: definitions and detection
By: Howard Wainer, Stephen G. Sireci, David Thissen
Contributors: Sireci, Stephen G.; Thissen, David
Series: Program statistics research technical report -- no. 91-9; RR-91-21; Research report (Educational Testing Service) -- RR-91-21
Publisher: Educational Testing Service
Published: 1991
Place of publication: Princeton, N.J
Language: eng
Number of pages: 29
Subjects: Examinations; Design and construction
Notes: Cover title.

Includes bibliographical references (p. 20-22).