An important function of TRB is to stimulate research that addresses
concerns, issues, or problems facing the transportation community. In
support of this function, TRB committees identify and develop research need
statements (RNS) for use by practitioners and researchers. A list of RNS
can be found here: https://rns.trb.org/.
The Census subcommittee (ABJ30(1)) wants to develop 2-3 research needs
statements with the goal of submitting one for NCHRP funding. We want your
ideas for possible research topics. Data methods as well as applied uses
are welcome. The idea needs to involve a Census product (including CTPP)
and should be related to transportation and urban data. You can also
include things like potential benefits, relevance to the transportation
community, and the end product you envision. We will be assembling a small
team to consider the ideas and develop some of them into full research
needs statements.
Please send an email directly to mkaminowitz(a)baltometro.org and
clara.reschovsky(a)dot.gov with your ideas by August 1. We look forward to
hearing from you!
Clara Reschovsky & Mara Kaminowitz, co-chairs, ABJ30(1)
*Mara Kaminowitz, GISP*GIS Coordinator
.........................................................................
*Baltimore Metropolitan Council*
Offices @ McHenry Row
1500 Whetstone Way
Suite 300
Baltimore, MD 21230
410-732-0500 ext. 1030
mkaminowitz(a)baltometro.org
www.baltometro.org
Dear CTPP folks
The week of June 27th I will be in New York City for several meetings. If you would like me to come and do a crash course of CTPP at your organization I would be open to that. Please message me off list at: pweinberger(a)aashto.org<mailto:pweinberger@aashto.org> and let me know. Please feel free to share this with off list users who may benefit from some training or hands on help.
Sincerely,
Penelope Z. Weinberger
CTPP Program Manager
AASHTO
202-624-3556
ctpp.transportation.org
I added a table below the map that contains some additional information. It
isn't very intuitive and it's hard to describe in the short column headings
in the table (I'm open to suggestions) but I'll leave a couple of notes
here and add some explanation to the production page later.
In the table, I have totals for each of the counties involved in the
selected commuter flows. This includes a "median" commuting distance for
commuters who live in the county and a median commuting distance for
commuters who work in the county.
In addition at the right side of the table, there are a couple of
percentages:
- the "% This County" shows the % of that county's residents are part of
the main selected county's workers (if "workplace" is the selected view) or
the % of that county's workers who are part of the main selected county's
residents (if "residence" is the selected view.)
- the % Selected County shows the % of the selected commuters who
live/work in this county (depending on the selected view), so these should
add to 100%.
The median distances are calculated using the same number that drives the
distance range criteria: the distance between the center of each census
tract. Thus, intra-tract commutes count as 0. By sorting the tracts by
distance, I found the tract-tract flow that contained the median commuter
(if 1,000 commuters, the 500th commuter) and used that flow distance as the
median.
Anyway, if nothing else the totals on the left side of the table will show
you what I have as the total workers/residents in my tables.
Thanks and let me know if any suggestions or questions,
Mark
I would be cautious, just did a quick check, it says ACS, but unsourced as to what ACS (I’m guessing 2009 – 2013 county to county flows – otherwise OD pairs are very tricky), also looking at just Montgomery county and DC, and expanding the tool to its maximum range (zero to 293 miles) it’s missing about half the total workers in each of those. Also, tracts are referenced, but that set is not reported at tract. I welcome your thoughts.
Penelope Z. Weinberger
CTPP Program Manager
AASHTO
202-624-3556
ctpp.transportation.org
From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Nancy Reger
Sent: Wednesday, May 25, 2016 4:08 PM
To: ctpp-news(a)chrispy.net
Subject: [CTPP] CTPP animation map
Check out this CTPP animation map – we didn’t make it. It’s very cool, wish we had-
http://bigbytes.mobyus.com/commute.aspx
Nancy Reger, AICP
Director, Data & Mapping | Mid-Ohio Regional Planning Commission
T: 614.233.4154 | M: 614.228.2663 | nreger(a)morpc.org<mailto:nreger@morpc.org>
111 Liberty Street, Suite 100 | Columbus, OH 43215
[MORPC_RGB_Secondary.png]<http://www.morpc.org/> [facebook button new.png] <http://www.facebook.com/morpc> [twitter button new.png] <http://www.twitter.com/morpc>
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/2006-201…>
.
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!
In today's media release the Census Bureau announced its upcoming
schedule for product distribution. In it were some "new" products that
may be of interest to people on this list. I will highlight a few below.
Here is the link to the entire media release .
http://www.census.gov/newsroom/press-releases/2016/cb16-101.html
In December we will see our first release of two non-overlapping 5-year
ACS data sets (2006-2010, and 2011-2015) .
On Thursday, July 21, 2016 we will see several "NEW" products.
1. 2014 Supplemental Estimates: This new product will consist of 58
detailed tables tabulated on the 2014 one-year microdata for geographies
with *populations of **20,000* or more. These supplemental estimates
will be released on American FactFinder and the Census Bureau’s
application programming interface, and will be available for the same
geographic summary levels as those in the American Community Survey
1-year dataset.
2. Statistical Testing Spreadsheet : This ACS statistical comparison
tool will allow users to carry out statistical testing for two or more
ACS estimates using the margin of error to determine whether the
estimates are significantly different (higher or lower) from each other
or are not significantly different (statistically tied) from each other.
In our CTPP world we also know of two other tools. One developed by the
NY State Data Center
(https://sdcclearinghouse.wordpress.com/2009/03/03/spreadsheet-to-calculate-…)
and another one developed by CUTR at the University of South Florida
(http://www.nctr.usf.edu/abstracts/abs77802.htm).
3. 2010-2014 replicate tables: This new product will provide expanded
versions of 107 detailed tables that are published in American
FactFinder. In addition to the published estimates and margins of error,
80 replicates for variance calculations are also provided. This product
is intended for advanced users and will allow them to calculate the
margins of error when aggregating across geographies or collapsing
categories within tables without using approximation formulas. The
replicate tables will be released on the FTP site with links available
on American FactFinder.
--
Ed Christopher
Transportation Planning Consultant
708-269-5237
