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ERIC Number: EJ125144
Record Type: Journal
Publication Date: 1975
Pages: N/A
Abstractor: N/A
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ISBN: N/A
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The 'Ability' Scale in Item Characteristic Curve Theory
Lord, Frederic M.
Psychometrika, 40, 2, 205-17, Jun 75
For the six available sets of empirical data, the discrimination (slope) parameter of the logistic item characteristic curve was found to have a significant positive correlation over items with the difficulty (location) parameter. This unpleasant situation can be eliminated by a suitably chosen transformation of the ability scale. (Author/RC)
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