Wolfram Demonstrations Project provides a playful pictorial comparison of the shapes of Rasch, 2-PL and 3-PL item characteristic curves (item response functions).
1, 2, 3-Parameter Logistic Rasch and Birnbaum Models and Item Analysis" from the Wolfram Demonstrations Project
demonstrations.wolfram.com/123ParameterLogisticRaschAndBirnbaumModelsAndItemAnalysis.
Contributed to Wolfram by: Olexandr Eugene Prokopchenko.
Comparing Rasch and IRT ICCs (IRFs): Wolfram Demonstrations Project ... Rasch Measurement Transactions, 2011, 251:2, 1328
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