Do you have any data that is based on some combination of things that are good indications of someone making San Francisco their permanent home, e.g.

- tax filings/returns (W-2 and 1040)

- utility bill payments

- high school graduation (or even enrollment) records

- rent receipts or rental contracts

I'm not saying all of those are required. But if the data come from a biased source (like one whose existence or funding is threatened if the data say these folks are all from out of town), then it's hard to accept it when absolutely no historical records are used to back it up.

> Can you point me to any of that research? If I'm wrong I'd like to update my belief

I'm curious why you feel the need to update your beliefs if you're wrong if this is your standard for evidence. Shouldn't you not have a belief in the first place?