VisualDF version 2.0.4 (date 1.4.14)
VisualDF was created to provide a free, open-source program with an intuitive Excel interface to compute effect size indices of differential functioning of items and tests/scales.
- Support for 1-3PL and GRM Models
- Prompt-driven set-up
- Open-source Visual Basic for Applications code
- Produces easily customizable graphs in Excel
Citing VisualDF: Meade, A. W. (2010). A taxonomy of differential functioning effect size indices. Journal of Applied Psychology, 95, 728-743.