Nice job Mark-- the motion is entertaining to watch.
I thought I'd share this visualization with all CTPP fans as well:
I built this a while ago, and
it'd be good to have you all look closely to keep me honest too! Do my
numbers add up to you? I've used county rather than tract data from CTPP
2006-2010. It does not show commuters that stay within the same county as
the project was only interested in long-distance commuters across counties.
(Note the bubble size adjuster in the lower right corner that makes the map
Josie Kressner, Ph.D.
3423 Piedmont Road NE Suite 481
Atlanta, GA 30305
On Thu, May 26, 2016 at 3:59 PM Jingjing Zang <JZang(a)camsys.com> wrote:
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?
*From:* ctpp-news-bounces(a)chrispy.net [mailto:
ctpp-news-bounces(a)chrispy.net] *On Behalf Of *Mark Evans
*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 may have.
I think Penelope mentioned it elsewhere, but the data is from the 2006-2010
ACS tract-tract commuter data
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!
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