Select by clicking on "Expected Score ICC". The ICC is the Item Characteristic Curve, also called the IRF, the Item Response Function. Expected Score ICC plots the model-expected item characteristic curve. This shows the Rasch-model prediction for each measure relative to item difficulty Its shape is always ascending monotonic. The dashed lines indicate the Rasch-half-point thresholds correspond to expected values of .5 score points. The intervals on the x-axis demarcated by dashed lines are the zones within which the expected score rounds to each observed category. To remove the dashed lines, double-click on them.
The x-axis in this plot corresponds to the scales in the "vertical rulers", Table 6.0.0
Buttons are described in Graph window.
