• consistent estimates of item parameters;

• rating scales.

• "partial credit";

• person and item fit;

• threshold analysis (illustrated);

• quantifies effect of local dependence.

Rescore

• change scoring function for items presenting non-disctiminating categories;

• form "partial credit" from multiple choice items using distractor analysis.

Differential Item Function [DIF]

• specify person factors, eg. gender, country;

• specify levels, eg. male, female;
• each level plotted against the ICC (illustrated);
• does ANOVA of person factor against class interval.

Measure

• estimate person location from calibrated test items;

• item estimates imported [templates] or selected from project;
• use all items or select subset only;
• large record numbers possible.

Equating Test Score

• select subset of items from item pool;

• plot ICC for each subset;
• select equating criteria;
• read equivalent values from plots (illustrated);
• display t-test analysis for subset-pairs.

Other Features

• combine multiple choice and polytomous items in the one analysis;

• simple visual controls for selecting data file and response format;
• amend illegal reponses, eg. typing errors in response data file;
• allocate illegal responses as missing data;
• distractor analysis for MC items to checking for cheating and strength/effectiveness of response distractors across an item;
• create item subsets for assessing level of dimensionality, local dependence;
• create complete data sets by deleting persons with missing data.