Free browser-based PPG-1 disproportionate impact analysis for California Community College research workflows.
DI Calculator is a free, independently developed tool designed to make PPG-1 disproportionate impact analysis easier to perform, review, and explain.
Use DI Calculator — Free Try with Synthetic Data
No account required. Analysis runs locally in your browser.
Analysis runs in the browser. Student data is processed on your device and is not uploaded to a server.
PPG-1 disproportionate impact for Success and Retention outcomes, from student-level records or aggregate counts, with custom analysis dimensions and intersectional analysis.
Small-group and complementary suppression in exported and printed output, to reduce the risk of revealing small groups.
Academic Year and Term views, filters, and Simple and Technical result modes.
CSV and printable reports that carry the same privacy protections.
DI Calculator is designed for institutional researchers, equity teams, administrators, and others who need to conduct PPG-1 disproportionate impact analysis without building calculations from scratch.
DI Calculator processes analysis data locally in the browser; files are not uploaded. Before using institutional data, follow your college or district’s applicable privacy, security, and data-use policies.
DI Calculator supports local PPG-1 analysis and analytical extensions. It is not an official California Community Colleges Chancellor’s Office reporting or submission system and does not reproduce every SEA/SEP reporting procedure.
DI Calculator is free to use. Training, workshops, implementation support, and custom institutional analytics work are available separately.
Feedback from people doing this work is welcome — what works, what’s missing, and what’s confusing.