Re: [CTPP] ACS Commute Visualization

Hi Mark, Thanks for the explanation! I’m looking at Montgomery county as an example, but had trouble duplicate the results. I’m assuming that the trip distance filter was the cause. I wonder how you apply the trip distance filter? Is it defined by distance between centroids of residence and workplace tracts? Thanks, JJ From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Mark Evans Sent: Thursday, May 26, 2016 3:34 PM To: ctpp-news(a)chrispy.net Subject: [CTPP] ACS Commute Visualization 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/…s/>. 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!