VisualDF version 2.0.4
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
Note: VisualDF is now baked into the MIRT package in R. This software is no longer actively maintained. Please see my guide to invariance testing using R instead.
Citing VisualDF: Meade, A. W. (2010). A taxonomy of differential functioning effect size indices. Journal of Applied Psychology, 95, 728-743.