Hi everyone,

First time poster to this message board. I had a question about David Dorn's commuting zone crosswalking files posted on his website, specifically files E5 and E6.
https://ddorn.net/data.htm

Dorn explicitly calls for a m:m merge with the ACS data on his website, and this does not work to convert the Public Use Microdata Areas (PUMAs) to commuting zones. Could someone explain why Dorn endorses this method?