Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsComparing the Normal Ogive and Logistic Item Characteristic Curveshttp://demonstrations.wolfram.com/ComparingTheNormalOgiveAndLogisticItemCharacteristicCurves/]]>http://demonstrations.wolfram.com/ComparingTheNormalOgiveAndLogisticItemCharacteristicCurves/Item Characteristic Curveshttp://demonstrations.wolfram.com/ItemCharacteristicCurves/]]>http://demonstrations.wolfram.com/ItemCharacteristicCurves/