An alternate definition of the ETS delta scale of item difficulty
By: Paul W. Holland and Dorothy T. Thayer
Contributors: Thayer, Dorothy T.
Series: ETS research report -- 85-43; Program Statistics Research, Technical report no. 85-64; Research report (Educational Testing Service) -- RR-85-43; Program statistics research technical report -- no. 85-64
Publisher: Educational Testing Service
Published: 1985
Place of publication: Princeton, N.J
Language: eng
Notes: Includes bibliographical references (p. 8).