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
From: ctpp-news-bounces(a)chrispy.net [mailto:email@example.com] On Behalf Of
Sent: Thursday, May 26, 2016 3:34 PM
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
I think Penelope mentioned it elsewhere, but the data is from the 2006-2010 ACS
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
Thanks for taking a look!