- Rasch, partial credit, and rating scale models
- Joint maximum likelihood estimation
- MLE, MAP, and EAP estimation of examinee ability
- Missing data allowed and handled by ignoring it or scoring it as zero
- Save item parameter estimates to database
- Save person parameter estimates to database
- Item fit and scale quality statistics
- Item map graph
New in Version 4.0!
- Marginal maximum likelihood estimation of item parameters
- 4PL, 3PL, and 2PL item response models for binary items
- Generalized partial credit model and partial credit model for polytomous items