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Difficulty plots: DIF analysis without the partial credit model
By Elizabeth Harrison
Published 5 May 2017 -
Constructing validity arguments for test combinations
By Saskia Wools, Theo Eggen, Anton Béguin
Published 24 Nov 2015 -
Predictive models of question difficulty - A critical review of the literature
By Debra Dhillon
Published 1 Feb 2003