" ERIC identifies voters who have moved, voters who have died, and voters with duplicate registrations within a state's database. "

Mathematically I wonder how many votes each of these exits is worth? Is it a multiplicate effect? Linear?

Seems like states with the most population outflow would be most valuable. People leave the state but don't de-register--makes it a safe for someone else to vote in their name or simply cast their ballot as if they were still there. Also city centers where people rent or move often would be good candidates for stale voter credentials.