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PDAF may refer to:
- Probabilistic data association filter, a statistical approach to the problem of plot association in a radar tracker
- Priority Development Assistance Fund, a discretionary fund in the Philippines
- Phase-detection autofocus, a type of autofocus used In some cameras
- Parallel Data Assimilation Framework Software environment for ensemble data assimilation 
| disambiguation page lists articles associated with the title PDAF.
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