CTPP Users:
We have just discovered a problem with CTPP Part 3 for Mean and Median
tables in the CTPP browser software. The specific tables affected are:
3-008 Mean travel time by Means of transportation to work and Time leaving
home to go to work
3-009 Median travel time by Means of transportation to work and Time
leaving home to go to work
3-011 Mean number of workers per vehicle by Time leaving home to go to
work
3-013 Mean number of workers per carpool by Time leaving home to go to
work
3-014 Aggregate travel time by Means of transportation to work and Time
leaving home to go to work
Do not use these tables in the software. We would advise you to use the
ASCII or CSV version of the data available from the Transtats website.
The specific link to Transtats is:
http://transtats.bts.gov/DL_SelectFields.asp?Table_ID=1348&DB_Short_Name=CT…
Once we have a fix, we will communicate more information to you. If you
have any questions or concerns, please contact either Clara Reschovsky at
clara.a.reschovsky(a)census.gov or Nanda Srinivasan at
nanda.srinivasan(a)fhwa.dot.gov. We apologize for any inconvenience.
Clara Reschovsky
Mr. Hutton - land use forecasts are likely more in the realm of
spreadsheets and general GIS programs than specific software for it.
Probably quite a few folks on this list could send you one of their
spreadsheets, but they may all be different and it might be as much work
to tinker with them for your needs than just starting from scratch. (Some
public and private agencies also do county-level forecasts if you're not
already aware of them.)
Mr. Srinivasan - hey, great sense of humor on the Do Not Call thing!
Sam Granato
Ohio DOT, Office of Technical Services
1980 W. Broad Street, Columbus, OH 43223
Phone: 614-644-6796, Fax: 614-752-8646
"Things are more like they are now than they've ever been before." -
Howard Maple
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Today's Topics:
1. Population Projections & Socio-economic Data (HuttonD(a)thempc.org)
2. National Personal Travel Survey (NPTS) -- Add-On Costs
(Srinivasan, Nanda)
----------------------------------------------------------------------
Message: 1
Date: Wed, 13 Jul 2005 15:37:33 -0400
From: HuttonD(a)thempc.org
Subject: [CTPP] Population Projections & Socio-economic Data
To: ctpp-news maillist <ctpp-news(a)chrispy.net>
Message-ID:
<OF609396C3.3636451C-ON8525703D.006A3FFD-8525703D.006BCF05(a)Thempc.org>
Content-Type: text/plain; charset="us-ascii"
We are an small MPO (250,000 population) and are interested in locating a
software program to help us with population projections and socio-economic
data on a TAZ level. The feature we are looking for is the ability to
adjust the long range projections based on annual growth. Does anybody
have any suggestions?
Dennis Hutton
Metropolitan Planning Commission
110 East State St.
P.O. Box 8246
Savannah, GA. 31412-8246
912-651-1450
All-
In the past week, we have received several e-mails expressing interest in the NPTS Add-On program. Many of you have asked us for a cost estimate. Because the next NPTS has not been designed, nor has contractor(s) selection been made, we cannot quote a price for add-on samples. However, we can give you some "guesses." Here is a list of common questions we've received so far, along with answers from Susan Liss (FHWA), and the rest of the NPTS team.
1. What did it cost in the past?
For the 2001 survey, the cost of an Add-on sample was $165 per completed household.
2. When will we know more about costs?
FHWA has let a Request For Information (RFI) to get projected costs for the next survey (using the 2001 survey content and approach as a strawman). The RFI was let on 6/24 and responses are due on 7/24. We expect to contact RFI responders during the month of August to work out questions and suggestions. We plan to have a much better estimate of survey costs by Labor Day.
The Request for Information, posted at:
<http://www2.eps.gov/spg/DOT/FHWA>
Go to Office of Acquisition Management, Washington DC, click on Posted Dates, then click on Previous Days, then go to June 24th and click on "Request for Information for Costs of Conducting the NPTS 01".
3. Why would the costs change from the 2001 survey?
>From my experience with the NPTS series, the response rate is the big driver of costs. Much of the survey resources are devoted to recruiting households and keeping them involved in the survey through completion. Since we conduct a telephone survey, we are hopeful that the Do Not Call List (which does not apply to research surveys) has made the public more amenable to participating in a telephone survey since they are not being deluged with telemarketer calls.
4. For planning purposes, what number should I use now?
I would use $175 per completed household. BUT, recognize this is my best guess-timate. It is not an actual cost estimate.
5. Is it possible that the costs will be less than the $165 per household that the add-ons paid in the 2001 survey?
Yes, it is possible. One of the reasons we let the Request For Information was to see if we could offer the add-on samples at a lower cost.
6. What if the next NPTS has different content and methods than the survey described in the Request for Information?
We will need to bear that in mind and make appropriate adjustments as we plan the next survey. However, we also plan to have enough Add-ons so that a survey very similar to the 2001 could be conducted for you, based on the cost estimates we receive from the RFI. There is certain core content to a household travel survey that will not change.
7. Is there a minimum sample size?
In the three survey years that add-ons have been conducted (1990, 1995 and 2001), we have suggested that a minimum sample of 1000 households be conducted for an add-on jurisdiction.
8. How can I calculate the appropriate sample size for my jurisdiction?
Appropriate sample size depends on the size of your area, the questions you want answered by the survey and the degree of statistical validity you need. Nancy McGuckin of the NPTS Team can help you get a better idea of an appropriate sample size.
Once the survey research firm(s) have been selected for the next NPTS, their sampling statisticians can work with you on sample size and other sample needs. (No, they don't try to sell you more samples--- my experience has been that they are annoyingly scientific about the process.)
9. How can I give my input for the next NPTS survey?
There are several ways -
. Respond to the RFI (see above) - comments and input on all aspects of the next NPTS are being solicited, in addition to the cost estimates
. Visit to the Community of Practice website for NPTS, where we are establishing a communications channel with our potential add-ons, other data users and other survey stakeholders. Go to <http://knowledge.fhwa.dot.gov/cops/hcx.nsf/home> Scroll to the bottom, and click on "Household Travel Data Program"
. Call or email one of the NPTS Team members
NPTS Team
Susan Liss, Project Manager, 202-366-5060, susan.liss(a)fhwa.dot.gov
Nancy McGuckin, Travel Behavior Analyst, 202-366-8750 nancy.mcguckin(a)fhwa.dot.gov (works on NPTS Tues, Wed afternoon & Thurs.)
Nanda Srinivasan, Travel Data Analyst, User Support & GIS, 202-366-5021 nanda.srinivasan(a)fhwa.dot.gov (yes, this is the same Nanda Srinivasan that also works on CTPP)
Yuki Nakamoto, SAS Programmer, 202-366-6958 yuki.nakamoto(a)fhwa.dot.gov (works on NPTS on Tues & Thurs)
Thank you for your interest in the NPTS Add-on Program. Those of us on the NPTS Team believe the Add-on component is a useful, tested, comprehensive way of obtaining a household travel dataset for your area.
We are an small MPO (250,000 population) and are interested in locating a
software program to help us with population projections and socio-economic
data on a TAZ level. The feature we are looking for is the ability to
adjust the long range projections based on annual growth. Does anybody
have any suggestions?
Dennis Hutton
Metropolitan Planning Commission
110 East State St.
P.O. Box 8246
Savannah, GA. 31412-8246
912-651-1450
Back in June, I asked this question:
"My question to the listserv members is (assuming an AASHTO pooled fund for a CTPP-like product), would you want an ACS tabulation of 2005-2009 using the 2000 TAZ definitions, and then, one year later, an ACS tabulation of 2006-2010 using the "new" TAZ definitions, with the 2006-2010 weighted/controlled to 2010 decennial census population counts?"
Summary: I received 7 replies to my query, and there was a tie. 3 people said they would like BOTH tabulation of 2005-2009 ACS with the 2000 TAZs, and tabulation of 2006-2010 ACS with new TAZs.
3 people said they would prefer to wait to use new 2010 TAZs for tabulating the first round of ACS.
1 person said that they thought having two different small area geographies for TAZs one year apart might result in disclosure avoidance problems.
Thanks for helping me think about this problem.
Elaine
The TENTH NATIONAL CONFERENCE ON TRANSPORTATION PLANNING FOR SMALL AND
MEDIUM-SIZED COMMUNITIES "TOOLS OF THE TRADE" will be held in Nashville,
Tennessee in September 2006.
Tools of the Trade is a national conference providing ready-to-use,
economical and practical techniques for transportation professionals in
small (under 50,000) and medium - sized (50,000 - 250,000) communities.
You are invited to participate in the 10th National "Tools of the Trade"
Conference by submitting an abstract for a presentation. A call for
abstracts with more detail is attached.
Jerry
Jerry Everett
Research Director
Center for Transportation Research
Suite 309 Conference Building
600 Henley Street
University of Tennessee
Knoxville, TN 37996
(865) 974-8275
I would like to know about other List Server services like ctpp-news that I may want to subscribe to. I don't have Internet access and I would have to set up any new subscriptions by e-mail.
Thanks,
George Petrek
Engineering Spec III
TPP, Traffic Analysis Section
P.O. Box 149217
Austin, TX 78714-9217
phone: (512) 486-5140
fax: (512) 486-5153
e-mail: gpetrek(a)dot.state.tx.us
This is some serious stuff. See attached Brief.
SENATE FUNDING LEVEL WOULD DOOM
AMERICAN COMMUNITY SURVEY & AUTOMATED
DATA COLLECTION IN 2010, CENSUS BUREAU SAYS
--
Ed Christopher
708-283-3534 (V)
708-574-8131 (cell)
FHWA RC-TST-PLN
19900 Governors Dr
Olympia Fields, IL 60461
All -
There has been substantial interest in and discussion about the next NPTS on several listserves. Many of you want to know more about being an Add-On jurisdiction in the next survey, including costs, timing, and any additional flexibility in the Add-on program. We are seeking input on both the potential costs and other elements of the next survey.
Survey Costs
FHWA has let a "Request for Information" (RFI) on the potential costs of the next NPTS. Although content and approach for the next NPTS have not been finalized, more information is needed on potential survey costs, especially for states and MPOs who are seriously considering the Add-on program. The approach taken in the Request for Information is to use the content and methods of the 2001 NHTS as a strawman survey, and to obtain separate costs for the GPS subsample, the nonresponse followup survey, and collecting and geocoding trip origins and destinations.
The Request for Information, posted at:
http://www2.eps.gov/spg/DOT/FHWA/OAM/Reference%2DNumber%2DDTFH61%2D05%2DRFI…
If the link does not work, try:
http://www2.eps.gov/spg/DOT/FHWA/postdatePrevDays_1.html,
Click on "Request for Information for Costs of Conducting the NPTS 01" under June 24, 2005.
The RFI will remain open for 30 days (until July 24, 2005).
Survey Design Elements
We encourage all who have questions, comments and suggestions for the next survey to submit their input. We need to know more about:
o current data users and their experiences with the survey series,
o non-users and the reasons they don't use the data series
o modelers needs and the changes in travel demand modeling
o data needs on specialized topics in personal travel, such as walk & bike, elderly mobility issues, etc.
There is a discussion forum called the Community of Practice where you can post questions, suggestions etc. The URL is http://knowledge.fhwa.dot.gov/cops/hcx.nsf/home?openform&Group=Household%20…
If the link does not work, please try:
http://knowledge.fhwa.dot.gov/cops/hcx.nsf/home
Scroll to the bottom, and click on "Household Travel Data Program"
Thank you
Nanda Srinivasan (On behalf of Susan Liss, FHWA)
We'd prefer to have the ACS five-year average tabulated using the "new"
TAZ definitions.
Laura Chen
Senior Transportation Planner
Atlanta Regional Commission
404-463-3173
-----Original Message-----
From: ctpp-news-bounces(a)chrispy.net
[mailto:ctpp-news-bounces(a)chrispy.net] On Behalf Of Murakami, Elaine
Sent: Wednesday, June 22, 2005 5:34 PM
To: ctpp-news(a)chrispy.net
Subject: [CTPP] TRB Census conference and ACS questions
These questions were recently sent in by Laura Chen, from Atlanta
Regional Commission and I thought I'd share my responses with the
listserv. Note: I have a question for listserv members at the end!
Q. Will the recommendations from the Irvine conference be available for
viewing?
A. Yes, but I don't know WHEN they are expected. I have left a message
for Tom Palmerlee at TRB to find out the status of the committee
recommendations from the Census conference.
Q. Will the 2006 release of the 2005 ACS includes tabulations at the TAZ
level?
A. No, the EARLIEST there could be TAZ tabulation will be either an
accumulation of ACS data from 2005 thru 2009, or 2006 thru 2010. There
MUST be 60 months of data accumulation before any small area data is
released by the Census Bureau.
For 2005 ACS tabulation, the data release will be limited to geographic
units with population of 65,000 or over. For example, a COUNTY total or
a CITY total, NOT for any small geographic units like census tracts
within that area.
Q. What has been decided on the inclusions of TAZ tabulations in
the ACS reports? Which TAZs would be used, existing 2000 TAZs or newly
defined TAZs?
A. We had a post-conference meeting with Bob LaMacchia from the CB's
Geography Division. It looks like 2008 would be the time for defining
new TAZs. The CB will be developing a GIS software for local entities to
submit geographic area boundaries. (This assumes that there will be an
AASHTO pooled fund project similar to CTPP2000 using ACS data). Because
of disclosure avoidance issues, I am thinking that there might need to
be one set of tables for small geography (TAZs, and tracts), and a
different set of tables for a larger geographic unit (like a SuperTAZ or
SuperTract) that would allow tabulation by household income (for
example). So, the TAZ definition process MIGHT include both "small"
TAZs as well as "SuperTAZs".
However, the earliest that these newly defined TAZs could be used for
tabulation would be 2010. That is, if 2005-2009 ACS were tabulated, the
CB would ONLY be able to use the 2000 TAZ definitions.
My question to the listserv members is (assuming an AASHTO pooled fund
for a CTPP-like product), would you want an ACS tabulation of 2005-2009
using the 2000 TAZ definitions, and then, one year later, an ACS
tabulation of 2006-2010 using the "new" TAZ definitions, with the
2006-2010 weighted/controlled to 2010 decennial census population
counts?
Elaine Murakami
FHWA Office of Planning
206-220-4460
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