ANATRI-1.0 - REPRESENTATION OF DICHOTOMOU S AND POLYTOMOUS ITEM CHARACTERISTIC FUNCTIONS

The ANATRI program helps the user in studying dichotomous and polytomo us 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 avail able. The user chooses the model and specifies its parameters for one or more items. Items characteristic (or operating characteristic) curv es are depicted. A deep analysis of just one item is also possible. Th is option allows a better understanding of peculiarities of each model .