Abstract
ANATRI 1.0: representation of dichotomous and polytomous item characteristic functions. The ANATRI program helps the user in studying dichotomous and polytomous Item Response Theory models. Normal and logistic versions for the 1-, 2-, 3- and 4-parameter models are included. Three polytomous models (Partial Credit, Nominal Response and Graded Response) are also available. The user chooses the model and specifies its parameters for one or more items. Items characteristic (or operating characteristic) curves are depicted. A deep analysis of just one item is also possible. This option allows a better understanding of peculiarities of each model.
