[thaumasiotes]

> I can't understand how we can model how many people will vote, when we don't even know how many people have moved out of cities this year. Half of my friends have left San Francisco

Moving out doesn't stop you from voting. I didn't change my voter registration when I moved from San Francisco to China. Years later, back in California, I voted in San Francisco, where I was still registered, despite residing in Hayward.

For verification purposes, they asked me when I voted what my address was. I was allowed to vote despite not knowing my own apartment number.