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The **nominal response model** is available if the data type is
**multiple choice** or **graded**. Each option of each item has
two parameters, the **threshold** and the **slope**. Unlike the
**graded response model**, no order is forced on the options. If
the data type is **graded**, then the value of the options is used
only for the initialisation and to compute the item characteristic
curves.

2011-09-23