CTPP

ctpp@listserv.transportation.org

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3069 discussions

by Jason Gillow

Hello I am new to idea of TAZs (traffic analysis zones). I was wondering if there has been any release of a new TAZs boundaries for the country? How are TAZs delineated for rural areas? (Non-MPO area) What is the best source in understanding TAZs and in relation to census data? Thank you Jason Jason Gillow Research/Planning Specialist II Ohio Valley Regional Development Commission P.O. Box 149 Waverly, OH 45690 Phone 740-947-2853 or 800-223-7491 (In Ohio) and Fax 740-947-3468 Website: www.ovrdc.org E-mail- jgillow(a)ovrdc.org

12 years, 6 months

Re: [CTPP] Census 2000 means of transportation to work

by Mike Harmon

Is it just me or is it almost impossible to find 2000 Census means of transportation to work by age?

12 years, 6 months

[CTPP] ACS 5-year Estimates

by Brian Chenault

Hello, Brian Chenault from the Hampton Roads Transportation Planning Organization here. We are trying to collect several pieces of data at the block group level using 2007-2011 ACS 5-year estimates. Using the Census' Summary File Excel Retrieval Tool, we are able to retrieve basic population data at the block group level. However, data at the block group level is not provided for poverty, language spoken at home, etc. This appeared to be the case even when examining 2006-2010/2005-2009 5-year estimates. Has this information not been "filtered down" from the census tract level yet? How is one supposed to go about gathering this type of updated information at the block group level? Much appreciated, Brian [Description: Description: Description: Description: Description: TPO-Heartbeat-Logo-FINAL]<http://www.hrtpo.org/> Brian Chenault Community Outreach Planner Hampton Roads Transportation Planning Organization The Regional Building | 723 Woodlake Drive | Chesapeake, Virginia | 23320 bchenault(a)hrpdcva.gov<mailto:bchenault(a)hrpdcva.gov> | http://www.hrtpo.org<http://www.hrtpo.org/> | Phone: 757.420.8300 | Fax: 757.523.4881

12 years, 6 months

Re: [CTPP] ACS 5-year Estimates

by pete＠swensson.us

Fellow CTPP afficionados: The MOE reported by Census is based on a 90% confidence interval, which is a common standard for scientific research -- it means that the confidence interval has a 90% likelihood of including the real value (aka 9 to 1 odds). The larger the MOE in relation to the estimated value, the less reliable the estimate. Relatively large MOEs do not necessarily mean the estimates are "worthless," as Ed notes. It all depends on your needs and purposes. It is good to strive for scientific certainty. But in the world of public policy-making, transportation planning, etc., we normally are obliged to make decisions with whatever is the best available data. We can't usually throw up our hands in despair if scientific certainty is not available. I'm retired now, but what I used to do when confronted with this quandary was to calculate just exactly how unreliable an estimate was before deciding what to do about it. A quick and dirty alternate way to look at it is to divide the MOE by 1.645 to get the Standard Error of the Estimate (SEE). The SEE represents the standard deviation around the estimate, which has a 68% likelihood of including the real value, or about 2 to 1 odds. If you look at the estimate and its SEE rather than its MOE, are you willing to take a deep breath and make needed decisions based on 2 to 1 odds, rather than wait for 9 to 1 odds? For another example, I might have a number from ACS or PUMS that wasn't significant at the 90% confidence level (e.g., has commuting between county A and county B actually gone up between year x and year y, or is it more accurate to say it was stable?). Using a standard built-in formula in Excel (NORMDIST) I could determine that the increase was significant at the 80% level. From my point of view, 80% confidence (or maybe even 70%) might be fine, depending on the nature of the question. Your mileage may vary. -- Pete Swensson retired from Thurston Regional Planning Council Olympia, WA Quoting Ed Christopher : Do we have a metric for useless? I have seen published data where the MOE is more than 85% of the estimate. Is this useless? What if the MOE is only 10% of the estimate. Anyone using any standards for what is considered useless. Also, at what point should this determination be put in the hands of the user/analyst? Ed C On Feb 15, 2013, at 9:33 PM, Patricia Becker wrote: Brian, Tell me something. Do you want to use these data for individual block groups or do you want to aggregate BGs to larger areas, such as TAZs? I hope you know that the sampling errors for single BG data are so high as to render the data absolutely useless. I think that's why you can't find the numbers. Patty Becker On Fri, Feb 15, 2013 at 3:35 PM, Brian Chenault wrote: Hello, Brian Chenault from the Hampton Roads Transportation Planning Organization here. We are trying to collect several pieces of data at the block group level using 2007-2011 ACS 5-year estimates. Using the Census’ Summary File Excel Retrieval Tool, we are able to retrieve basic population data at the block group level. However, data at the block group level is not provided for poverty, language spoken at home, etc. This appeared to be the case even when examining 2006-2010/2005-2009 5-year estimates. Has this information not been “filtered down” from the census tract level yet? How is one supposed to go about gathering this type of updated information at the block group level? Much appreciated, Brian Brian Chenault Community Outreach Planner Hampton Roads Transportation Planning Organization The Regional Building | 723 Woodlake Drive | Chesapeake, Virginia | 23320 bchenault(a)hrpdcva.gov | http://www.hrtpo.org | Phone: 757.420.8300 | Fax: 757.523.4881 _______________________________________________ ctpp-news mailing list ctpp-news(a)ryoko.chrispy.net http://ryoko.chrispy.net/mailman/listinfo/ctpp-news -- Patricia C. (Patty) Becker APB Associates/Southeast Michigan Census Council (SEMCC) 28300 Franklin Rd, Southfield, MI 48034 office: 248-354-6520 home:248-355-2428 pbecker(a)umich.edu _______________________________________________ ctpp-news mailing list ctpp-news(a)ryoko.chrispy.net http://ryoko.chrispy.net/mailman/listinfo/ctpp-news ------------------------- _______________________________________________ ctpp-news mailing list ctpp-news(a)ryoko.chrispy.net http://ryoko.chrispy.net/mailman/listinfo/ctpp-news

12 years, 6 months

Re: [CTPP] ACS 5-year Estimates

by Ed Christopher

Do we have a metric for useless? I have seen published data where the MOE is more than 85% of the estimate. Is this useless? What if the MOE is only 10% of the estimate. Anyone using any standards for what is considered useless. Also, at what point should this determination be put in the hands of the user/analyst? Ed C On Feb 15, 2013, at 9:33 PM, Patricia Becker <pbecker(a)umich.edu> wrote: > Brian, > > Tell me something. Do you want to use these data for individual block groups or do you want to aggregate BGs to larger areas, such as TAZs? I hope you know that the sampling errors for single BG data are so high as to render the data absolutely useless. I think that's why you can't find the numbers. > > Patty Becker > > On Fri, Feb 15, 2013 at 3:35 PM, Brian Chenault <bchenault(a)hrtpo.org> wrote: >> Hello, >> >> >> >> Brian Chenault from the Hampton Roads Transportation Planning Organization here. We are trying to collect several pieces of data at the block group level using 2007-2011 ACS 5-year estimates. Using the Census’ Summary File Excel Retrieval Tool, we are able to retrieve basic population data at the block group level. However, data at the block group level is not provided for poverty, language spoken at home, etc. This appeared to be the case even when examining 2006-2010/2005-2009 5-year estimates. Has this information not been “filtered down” from the census tract level yet? How is one supposed to go about gathering this type of updated information at the block group level? >> >> >> >> Much appreciated, >> >> >> >> Brian >> >> >> >> <image001.png> >> >> >> >> Brian Chenault >> >> Community Outreach Planner >> >> Hampton Roads Transportation Planning Organization >> >> The Regional Building | 723 Woodlake Drive | Chesapeake, Virginia | 23320 >> >> bchenault(a)hrpdcva.gov | http://www.hrtpo.org | Phone: 757.420.8300 | Fax: 757.523.4881 >> >> >> >> >> >> >> _______________________________________________ >> ctpp-news mailing list >> ctpp-news(a)ryoko.chrispy.net >> http://ryoko.chrispy.net/mailman/listinfo/ctpp-news > > > > -- > Patricia C. (Patty) Becker > APB Associates/Southeast Michigan Census Council (SEMCC) > 28300 Franklin Rd, Southfield, MI 48034 > office: 248-354-6520 > home:248-355-2428 > pbecker(a)umich.edu > _______________________________________________ > ctpp-news mailing list > ctpp-news(a)ryoko.chrispy.net > http://ryoko.chrispy.net/mailman/listinfo/ctpp-news

12 years, 6 months

[CTPP] ACS Data Users

by Ed Christopher

This new group may be of interest to some. With funding from the U.S. Census Bureau, the Population Reference Bureau (PRB) and Sabre Systems are forming a new American Community Survey (ACS) Data Users Group. The purpose of the ACS Data Users Group is to improve understanding of the value and utility of ACS data. Membership in the group is free and open to all interested ACS data users. The ACS Data Users Group will not play a role in advising the Census Bureau or advocating to the Census Bureau on behalf of ACS data users. The group is led by a Steering Committee, of which I am a member, that represents a broad spectrum of data users with different interests. To facilitate communication among ACS data users, PRB and Sabre Systems will create and maintain an online forum, organize webinars and special sessions at professional meetings, and hold an annual ACS Data Users Conference. The online forum is the centerpiece of this project and will provide a discussion site where people can share messages, materials, and announcements related to ACS data and methods. Specific activities and topics will be determined based on input from ACS Data Users Group members, Steering Committee members, and Census Bureau staff. To collect information about activities and topics of interest to ACS data users, and to start assembling a preliminary list of ACS Data Users Group members, the Steering Committee has created a brief survey questionnaire (http://www.surveymonkey.com/s/ACSDataUsers). The survey takes about 10-15 minutes to complete. Individual responses will be kept confidential; only the aggregate data will be reported. Please respond by March 8. If you have any questions about the survey, please contact Mark Mather, Associate Vice President of Domestic Programs at the Population Reference Bureau at mmather(a)prb.org or 202-939-5433. Thank you for your time! -- Ed Christopher 708-283-3534 (V) 708-574-8131 (cell) FHWA RC-TST-PLN 4749 Lincoln Mall Drive, Suite 600 Matteson, IL 60443

12 years, 6 months

[CTPP] RFP to Assess the Utility of 2006 - 2010 CTPP Data

by Weinberger

Apologies for cross posting, but we want wide distribution... Hi All Here is a link to download the newly released RFP from the CTPP Program to assess the utility of the upcoming release of five-year CTPP data. Please click the link and download the RFP if you are interested in performing this research. Please forward this email as appropriate. http://ctpp.transportation.org/Pages/default.aspx Thanks! Penelope Z. Weinberger CTPP Program Manager AASHTO 202-624-3556 ctpp.transportation.org

12 years, 6 months

[CTPP] County Commuting Flows

by Estersohn Dan

Is there any information about production of the CTTP or the county-to-county commuting flows more than once every ten years? Since they are based on the annual ACS there is an opportunity for more frequent updates than in the past. What are the current plans? Dan Estersohn Senior Demographer Arbitron Inc 9705 Patuxent Woods Drive Columbia, MD 21046 410-312-8434 Dan.Estersohn(a)Arbitron.com

12 years, 6 months

[CTPP] Census TRB presentations online

by Mara Kaminowitz

For those that missed Census sub-committee at TRB last month, the presentations can be found online here: http://trbcensus.com/notes.html With the release of the new CTPP data and the continuing ACS releases, we are looking forward to exciting things in the next few years. Please make note of any work you are doing with the new data. We want to hear from you next year! *Mara Kaminowitz, GISP *GIS Analyst ......................................................................... *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

12 years, 6 months

Re: [CTPP] Fwd: U.S. Census Bureau Announces Release of 4 ACS Products

by Mara Kaminowitz

It was the same for me yesterday. This morning they seem to be working. Mara *From:* ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net] *On Behalf Of *Lindeman, Nicholas (MPO) *Sent:* Tuesday, January 29, 2013 4:40 PM *To:* ctpp-news(a)chrispy.net *Subject:* Re: [CTPP] Fwd: U.S. Census Bureau Announces Release of 4 ACS Products I am experiencing significant trouble in accessing the data in the new AFF. The ‘Community Facts’ area returns no data. In the ‘Guided Search’ area the grey ‘get me started’ button does nothing. I am entirely unable to access this area. In the ‘Advanced Search’ area the grey ‘show me all’ button does nothing. I am entirely unable to access this area. The Guided Search and Advanced Search links contained in the blue horizontal bar near the top of the screen do not function. I take it I’m not the only one having these problems? Does anyone have contact information for the appropriate person at the Census to report these problems? Something a bit more direct than the Feedback link would be nice. Nick Nicholas Lindeman Economic & Systems Data Analyst Nashville Area MPO 800 2nd Ave. S. P.O. Box 196300 Nashville, TN 37219-6300 (615) 862-7198 lindeman(a)nashvillempo.org http://www.nashvillempo.org

12 years, 6 months

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