private vehicle occupancy data from ACS

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Jim Hubbell

20 May 2011 20 May '11

3:35 p.m.

I'm trying to track down an estimate of private vehicle occupancy from the 2009 ACS 1-year estimates, and am having some difficulty finding the table that includes this calculation. Can anyone provide me with the ACS table number? Any help would be greatly appreciated. Thanks, Jim Hubbell Transportation Planner II Mid-America Regional Council 600 Broadway, Suite 200 Kansas City, MO 64105-1659 816.701.8319 voice 816.421.7758 fax

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Polzin, Steve

20 May 20 May

4:18 p.m.

there is no data on occupancy only household vehicle availability. The 2009 NHTS would have vehicle occupancy data. From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Jim Hubbell Sent: Friday, May 20, 2011 4:35 PM To: ctpp-news(a)chrispy.net Subject: [CTPP] private vehicle occupancy data from ACS I'm trying to track down an estimate of private vehicle occupancy from the 2009 ACS 1-year estimates, and am having some difficulty finding the table that includes this calculation. Can anyone provide me with the ACS table number? Any help would be greatly appreciated. Thanks, Jim Hubbell Transportation Planner II Mid-America Regional Council 600 Broadway, Suite 200 Kansas City, MO 64105-1659 816.701.8319 voice 816.421.7758 fax

Ed Christopher

5:06 p.m.

Don't mind Steve--he is just giving a shameless plug for the NHTS ;-) In the ACS you can get a vehicle occupancy for people commuting to work. It takes a little work but you can calculate it from table B8301 (mode to work). The trick is what assumption do you use for the 5-6 people per car (maybe 5.5) cohort and the 7+ category. In 1990 we actually knew the factor and it was around 0.3xxx. Try a few numbers and see what you like, 7.2 people per car; 7.3, but I would not go over 7.5 Now for another shameless plug. One of the beauties of the CTPP tabulations is that there is a vehicle occupancy table for the work commuters. Unfortunately, with the 3-year CTPP it is only carried out to 1 decimal so everything is 1.1. I believe the 5-year tab due out sometime in 2013 will have 2 decimal places. Back to the NHTS, it's strength here is that it has all trip purposes. Polzin, Steve wrote:

...

-- Ed Christopher 708-283-3534 (V) 708-574-8131 (cell) FHWA RC-TST-PLN 4749 Lincoln Mall Drive, Suite 600 Matteson, IL 60443

Patty Becker

5:25 p.m.

You don't need 2 decimal places. The data don't support that level of precision!!! Patty Becker At 06:06 PM 5/20/2011, you wrote:

...

Ed Christopher

6:16 p.m.

Patty--you are right about the precision but in the transportation world folks tend to like and use 2 decimal places. Of course in the transportation world folks also like small area data which too has its statical concerns. Patty Becker wrote:

...

You don't need 2 decimal places. The data don't support that level of precision!!! Patty Becker At 06:06 PM 5/20/2011, you wrote:

------------------------------------------------------------------------------------------------- Patricia C. (Patty) Becker 248/354-6520 APB Associates/SEMCC FAX 248/354-6645 28300 Franklin Road Home 248/355-2428 Southfield, MI 48034 pbecker(a)umich.edu ------------------------------------------------------------------------ _______________________________________________ ctpp-news mailing list ctpp-news(a)chrispy.net http://www.chrispy.net/mailman/listinfo/ctpp-news

-- Ed Christopher 708-283-3534 (V) 708-574-8131 (cell) FHWA RC-TST-PLN 4749 Lincoln Mall Drive, Suite 600 Matteson, IL 60443

Alan

21 May 21 May

7:36 a.m.

Thanks Ed: I didn't want to have to correct Steve. Isn't there a total vehicle count also somewhere in ACS? I recall using it to calc the top category so that it all comes out right. -----Original Message----- From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Ed Christopher Sent: Friday, May 20, 2011 6:06 PM To: ctpp-news(a)chrispy.net Subject: Re: [CTPP] RE: private vehicle occupancy data from ACS Don't mind Steve--he is just giving a shameless plug for the NHTS ;-) In the ACS you can get a vehicle occupancy for people commuting to work. It takes a little work but you can calculate it from table B8301 (mode to work). The trick is what assumption do you use for the 5-6 people per car (maybe 5.5) cohort and the 7+ category. In 1990 we actually knew the factor and it was around 0.3xxx. Try a few numbers and see what you like, 7.2 people per car; 7.3, but I would not go over 7.5 Now for another shameless plug. One of the beauties of the CTPP tabulations is that there is a vehicle occupancy table for the work commuters. Unfortunately, with the 3-year CTPP it is only carried out to 1 decimal so everything is 1.1. I believe the 5-year tab due out sometime in 2013 will have 2 decimal places. Back to the NHTS, it's strength here is that it has all trip purposes. Polzin, Steve wrote:

...

there is no data on occupancy only household vehicle availability. The

2009 NHTS would have vehicle occupancy data.

...

From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net]

On Behalf Of Jim Hubbell

...

Sent: Friday, May 20, 2011 4:35 PM To: ctpp-news(a)chrispy.net Subject: [CTPP] private vehicle occupancy data from ACS I'm trying to track down an estimate of private vehicle occupancy from the

2009 ACS 1-year estimates, and am having some difficulty finding the table that includes this calculation. Can anyone provide me with the ACS table number? Any help would be greatly appreciated.

...

Thanks, Jim Hubbell Transportation Planner II Mid-America Regional Council 600 Broadway, Suite 200 Kansas City, MO 64105-1659 816.701.8319 voice 816.421.7758 fax ------------------------------------------------------------------------ _______________________________________________ ctpp-news mailing list ctpp-news(a)chrispy.net http://www.chrispy.net/mailman/listinfo/ctpp-news

Chu, Xuehao

8:23 a.m.

Table B25046 has a total vehicle count. B25046. AGGREGATE NUMBER OF VEHICLES AVAILABLE BY TENURE - Universe: OCCUPIED HOUSING UNITS Data Set: 2009 American Community Survey 1-Year Estimates Survey: American Community Survey NOTE. Although the American Community Survey (ACS) produces population, demographic and housing unit estimates, it is the Census Bureau's Population Estimates Program that produces and disseminates the official estimates of the population for the nation, states, counties, cities and towns and estimates of housing units for states and counties. For information on confidentiality protection, sampling error, nonsampling error, and definitions, see Survey Methodology. Florida Estimate Margin of Error Aggregate number of vehicles available: 11,458,895 +/-53,546 Owner occupied 8,615,224 +/-56,655 Renter occupied 2,843,671 +/-34,793 Source: U.S. Census Bureau, 2009 American Community Survey ________________________________________ From: ctpp-news-bounces(a)chrispy.net [ctpp-news-bounces(a)chrispy.net] On Behalf Of Alan [AlanPisarski(a)AlanPisarski.com] Sent: Saturday, May 21, 2011 8:36 AM To: ctpp-news(a)chrispy.net Subject: RE: [CTPP] RE: private vehicle occupancy data from ACS Thanks Ed: I didn't want to have to correct Steve. Isn't there a total vehicle count also somewhere in ACS? I recall using it to calc the top category so that it all comes out right. -----Original Message----- From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Ed Christopher Sent: Friday, May 20, 2011 6:06 PM To: ctpp-news(a)chrispy.net Subject: Re: [CTPP] RE: private vehicle occupancy data from ACS Don't mind Steve--he is just giving a shameless plug for the NHTS ;-) In the ACS you can get a vehicle occupancy for people commuting to work. It takes a little work but you can calculate it from table B8301 (mode to work). The trick is what assumption do you use for the 5-6 people per car (maybe 5.5) cohort and the 7+ category. In 1990 we actually knew the factor and it was around 0.3xxx. Try a few numbers and see what you like, 7.2 people per car; 7.3, but I would not go over 7.5 Now for another shameless plug. One of the beauties of the CTPP tabulations is that there is a vehicle occupancy table for the work commuters. Unfortunately, with the 3-year CTPP it is only carried out to 1 decimal so everything is 1.1. I believe the 5-year tab due out sometime in 2013 will have 2 decimal places. Back to the NHTS, it's strength here is that it has all trip purposes. Polzin, Steve wrote:

...

there is no data on occupancy only household vehicle availability. The

2009 NHTS would have vehicle occupancy data.

...

From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net]

On Behalf Of Jim Hubbell

...

Sent: Friday, May 20, 2011 4:35 PM To: ctpp-news(a)chrispy.net Subject: [CTPP] private vehicle occupancy data from ACS I'm trying to track down an estimate of private vehicle occupancy from the

2009 ACS 1-year estimates, and am having some difficulty finding the table that includes this calculation. Can anyone provide me with the ACS table number? Any help would be greatly appreciated.

...

-- Ed Christopher 708-283-3534 (V) 708-574-8131 (cell) FHWA RC-TST-PLN 4749 Lincoln Mall Drive, Suite 600 Matteson, IL 60443 _______________________________________________ ctpp-news mailing list ctpp-news(a)chrispy.net http://www.chrispy.net/mailman/listinfo/ctpp-news __________ Information from ESET Smart Security, version of virus signature database 6140 (20110521) __________ The message was checked by ESET Smart Security. http://www.eset.com __________ Information from ESET Smart Security, version of virus signature database 6140 (20110521) __________ The message was checked by ESET Smart Security. http://www.eset.com _______________________________________________ ctpp-news mailing list ctpp-news(a)chrispy.net http://www.chrispy.net/mailman/listinfo/ctpp-news

wendell cox

8:47 a.m.

Problem is that this is a gross vehicle count at the household level, and does not relate to commuting, so I don't think it solves the problem. The vehicle occupancy issue relates to work trips. Perhaps there is a vehicle count available elsewhere in ACS, though the suggestions advanced by others should get the number to a pretty good level of precision. Best, Wendell Cox On Sat, May 21, 2011 at 1:23 PM, Chu, Xuehao <xchu(a)cutr.usf.edu> wrote:

...

there is no data on occupancy only household vehicle availability. The

2009 NHTS would have vehicle occupancy data.

From: ctpp-news-bounces(a)chrispy.net [mailto:

ctpp-news-bounces(a)chrispy.net] On Behalf Of Jim Hubbell

Sent: Friday, May 20, 2011 4:35 PM To: ctpp-news(a)chrispy.net Subject: [CTPP] private vehicle occupancy data from ACS I'm trying to track down an estimate of private vehicle occupancy from

the 2009 ACS 1-year estimates, and am having some difficulty finding the table that includes this calculation. Can anyone provide me with the ACS table number? Any help would be greatly appreciated.

-- -- Wendell Cox Demographia | Wendell Cox Consultancy - St. Louis Missouri-Illinois metropolitan region Visiting Professor, Conservatoire National des Arts et Metiers, Paris +1.618 632 8507 www.demographia.com | www.publicpurpose.com | www.rentalcartours.net Books & Publications WAR ON THE DREAM: How Anti-Sprawl Policy Threatens the Quality of Life http://www.demographia.com/wod1.pdf 7th ANNUAL DEMOGRAPHIA INTERNATIONAL HOUSING AFFORDABILITY SURVEY ( http://www.demographia.com/dhi.pdf) THE WAL-MART REVOLUTION: How Big-Box Stores Benefit Consumers, Workers, and the Economy By Richard Vedder & Wendell Cox

Ed Christopher

9:17 a.m.

There is a total vehicle count but it is the total number available at the household. Doesn't always match the vehicles you get when you multiply add up all the vehicles used to commute. Alan wrote:

...

there is no data on occupancy only household vehicle availability. The

2009 NHTS would have vehicle occupancy data.

From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net]

On Behalf Of Jim Hubbell

Sent: Friday, May 20, 2011 4:35 PM To: ctpp-news(a)chrispy.net Subject: [CTPP] private vehicle occupancy data from ACS I'm trying to track down an estimate of private vehicle occupancy from the

2009 ACS 1-year estimates, and am having some difficulty finding the table that includes this calculation. Can anyone provide me with the ACS table number? Any help would be greatly appreciated.

-- Ed Christopher 708-283-3534 (V) 708-574-8131 (cell) FHWA RC-TST-PLN 4749 Lincoln Mall Drive, Suite 600 Matteson, IL 60443

Polzin, Steve

22 May 22 May

11:11 a.m.

I stand corrected i fact I remember trying to do that at one time. -----Original Message----- From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Alan Sent: Saturday, May 21, 2011 8:36 AM To: ctpp-news(a)chrispy.net Subject: RE: [CTPP] RE: private vehicle occupancy data from ACS Thanks Ed: I didn't want to have to correct Steve. Isn't there a total vehicle count also somewhere in ACS? I recall using it to calc the top category so that it all comes out right. -----Original Message----- From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Ed Christopher Sent: Friday, May 20, 2011 6:06 PM To: ctpp-news(a)chrispy.net Subject: Re: [CTPP] RE: private vehicle occupancy data from ACS Don't mind Steve--he is just giving a shameless plug for the NHTS ;-) In the ACS you can get a vehicle occupancy for people commuting to work. It takes a little work but you can calculate it from table B8301 (mode to work). The trick is what assumption do you use for the 5-6 people per car (maybe 5.5) cohort and the 7+ category. In 1990 we actually knew the factor and it was around 0.3xxx. Try a few numbers and see what you like, 7.2 people per car; 7.3, but I would not go over 7.5 Now for another shameless plug. One of the beauties of the CTPP tabulations is that there is a vehicle occupancy table for the work commuters. Unfortunately, with the 3-year CTPP it is only carried out to 1 decimal so everything is 1.1. I believe the 5-year tab due out sometime in 2013 will have 2 decimal places. Back to the NHTS, it's strength here is that it has all trip purposes. Polzin, Steve wrote:

...

there is no data on occupancy only household vehicle availability. The

2009 NHTS would have vehicle occupancy data.

...

From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net]

On Behalf Of Jim Hubbell

...

Sent: Friday, May 20, 2011 4:35 PM To: ctpp-news(a)chrispy.net Subject: [CTPP] private vehicle occupancy data from ACS I'm trying to track down an estimate of private vehicle occupancy from the

2009 ACS 1-year estimates, and am having some difficulty finding the table that includes this calculation. Can anyone provide me with the ACS table number? Any help would be greatly appreciated.

...

Elaine.Murakami＠dot.gov

20 May 20 May

4:50 p.m.

B08301 includes: Drove Alone, Carpool 2, Carpool 3, and Carpool 4+ I would use ACS PUMS for your region to estimate a better value for "4+" (I use IPUMS at Univ of MN http://usa.ipums.org/usa/sda/ ). Maybe it should be "4.2" or if you have a lot of vanpools, you might need to increase it to a larger value. Of course, if don't have to rely on 2009 1-year ACS, you can use the 2006-2008 CTPP. http://ctpp.transportation.org/Pages/3yrdas.aspx There are several tables: 12106 is a univariate table of means of transportation to work. It includes: Drove alone, CP2, CP3, CP4, CP 5-6, CP7+ 12109 is "workers per car, truck or van" 12235 is "workers per carpool by time leaving home" (only carpoolers included) If you need help pulling data from CTPP, you can contact Penelope Weinberger at AASHTO pweinberger(a)aashto.org; or Liang Long (CTPP Tech Support) liang.long(a)dot.gov From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Jim Hubbell Sent: Friday, May 20, 2011 1:35 PM To: ctpp-news(a)chrispy.net Subject: [CTPP] private vehicle occupancy data from ACS I'm trying to track down an estimate of private vehicle occupancy from the 2009 ACS 1-year estimates, and am having some difficulty finding the table that includes this calculation. Can anyone provide me with the ACS table number? Any help would be greatly appreciated. Thanks, Jim Hubbell Transportation Planner II Mid-America Regional Council 600 Broadway, Suite 200 Kansas City, MO 64105-1659 816.701.8319 voice 816.421.7758 fax

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participants (8)

Alan
Chu, Xuehao
Ed Christopher
Elaine.Murakami＠dot.gov
Jim Hubbell
Patty Becker
Polzin, Steve
wendell cox