AN ALTERNATE DEFINITION OF THE ETS DELTA SCALE OF ITEM DIFFICULTY

Paul W. Holland · Dorothy T. Thayer

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Psychometric Methodologies and Testing Educational Assessment and Pedagogy Educational Technology and Assessment

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ABSTRACT This note develops an alternative definition of the “delta scale” of item difficulty that is used at ETS. A comparison is given with the traditional definition of the delta scale that is based on the normal distribution. Some advantages of the alternative scale are mentioned.

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1969Statistical Theories of Mental Test Scores

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