Hey - hope this goes through. I'm Mark Evans and I developed the commuter map. Ed Christopher told me about this listserv. I'm happy to answer any questions that you may have. I think Penelope mentioned it elsewhere, but the data is from the 2006-2010 ACS tract-tract commuter data <https://www.fhwa.dot.gov/planning/census_issues/ctpp/data_products/2006-2010_tract_flows/> . I calculated a CV using the estimate and the MOE. I've seen some warnings about the high level of error in some of the ACS data with recommendations to include only data with CV < 30-40%. Unfortunately, this removes almost all the data, so the default setting I used is 80%. Even at this high level, it excludes a portion of the estimated commuters at the tract level. In addition, anyone who works and lives in the same tract would not be included. Thanks for taking a look!