Using software from SPSS, SAS, and other sources, Questar frequently conducts all types of analysis, including:
- Factor analysis
- Cluster analysis
- Regression analysis
- Generalizability and multivariate generalizability analysis
- ANOVAS and other inferential analysis
Item analysis usually involves the application of Classical True Score and Item Response Theory (IRT) models, including:
- Classical True Score item analysis
- Rasch calibration, scaling, and equating
- 3PL/GPC calibration, scaling, and equating
- Differential item functioning (DIF) analysis