An Alternate Definition of the ETS Delta Scale of Item Difficulty. Program Statistics Research [electronic resource] / Paul W. Holland and Dorothy T. Thayer.

An alternative definition has been developed of the delta scale of item difficulty used at Educational Testing Service. The traditional delta scale uses an inverse normal transformation based on normal ogive models developed years ago. However, no use is made of this fact in typical uses of item del...

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Bibliographic Details

Online Access:	Full Text (via ERIC)
Main Author:	Holland, Paul W.
Corporate Author:	Educational Testing Service. Program Statistics Research Project
Other Authors:	Thayer, Dorothy T.
Format:	Electronic eBook
Language:	English
Published:	[S.l.] : Distributed by ERIC Clearinghouse, 1985.
Subjects:	Difficulty Level. Error Patterns. Estimation (Mathematics) Item Analysis. Mathematical Models. Predictive Validity. Scaling. Test Items.