2 Dec
2016
2 Dec
'16
2:50 p.m.
The LEHD uses the great circle distance between worker's residence and the
physical location of establishment.
More details below (Source:The LEHD Infrastructure Files and the Creation
of the Quarterly Workforce Indicators
http://lehd.ces.census.gov/doc/technical_paper/tp-2006-01.pdf)
In order to impute establishment-level characteristics to job histories of
multi-unit employers, non-ignorable missing data model with multiple
imputation was developed. The model imputes establishment-of-employment
using two key characteristics available in the LEHD Infrastructure Files:
1) distance between place-of-work and place-of-residence and 2) the
distribution of employment across establishments of multi-unit employers,
The distance to work model is estimated using data from Minnesota, where
both the State Employer Identification Number (SEIN) and thee firm’s
reporting unit or establishment (called SEINUNIT in the LEHD system)
identifiers appear on a UI wage record.
[image: pasted1]
On Fri, Dec 2, 2016 at 3:32 PM Cervenka, Kenneth (FTA) <
Kenneth.Cervenka(a)dot.gov> wrote:
Hello,
Both Kevin Tierney and Alex Karner are quite right about there not being a
“distance” table in the ACS/CTPP files.
But now this brings up an interesting secondary question: exactly how is
this being calculated in the LEHD product? Unless everyone who commutes to
work drives their own car in a mostly uncongested and non-tolled
environment, this is actually a lot more complicated to “get right” than
one might think, even if a road network-based find-the-minimum-path
approach is used. I presume there is documentation about how the
distance-based calculations are being done (surely it is something more
than a straight-line between two centroids, multiplied by a national factor
to represent circuity for auto travelers, but that would be my guess), but
a quick search of LEHD and LODE documents did not reveal the answer.
Ken Cervenka
FTA Office of Planning
*From:* ctpp-news-bounces(a)chrispy.net [mailto:
ctpp-news-bounces(a)chrispy.net] *On Behalf Of *Kevin Tierney
*Sent:* Friday, December 02, 2016 2:27 PM
*To:* ctpp-news(a)chrispy.net
*Subject:* Re: [CTPP] Distance travveled to work
No. Some users noted a desire for it in the recent CTPP Assessment, but
others indicated they get that information from their travel models.
*From:* ctpp-news-bounces(a)chrispy.net [mailto:
ctpp-news-bounces(a)chrispy.net] *On Behalf Of *Alex Karner
*Sent:* Friday, December 02, 2016 2:21 PM
*To:* ctpp-news(a)chrispy.net
*Subject:* Re: [CTPP] Distance travveled to work
ACS has commute time but not distance. With CTPP you can use OD flows to
calculate distance using network approaches or assuming straight lines. No
way to get distance directly as far as I know.
-Alex
--
*Alex Karner, PhD*
Assistant Professor
School of City & Regional Planning
Georgia Institute of Technology
*alexkarner.com <http://www.alexkarner.com/>*
------------------------------
*From:* Mara Kaminowitz <mkaminowitz(a)baltometro.org>
*To:* "ctpp-news(a)chrispy.net" <ctpp-news(a)chrispy.net>
*Sent:* Friday, December 2, 2016 2:07 PM
*Subject:* [CTPP] Distance travveled to work
Hello,
Is there a table in ACS or CTPP that gives the distance traveled to work?
I know it's in LEHD but I'd like to pin down another source.
Mara
--
Mara Kaminowitz, GISP
GIS Coordinator
.........................................................................
Baltimore Metropolitan Council
Offices @ McHenry Row
1500 Whetstone Way
Suite 300
Baltimore, MD 21230
410-732-0500 ext. 1030 <(410)%20732-0500>
mkaminowitz(a)baltometro.org
www.baltometro.org
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