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

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(a)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: 2009 NHTS would have vehicle occupancy data. On Behalf Of Jim Hubbell 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

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(a)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(a)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: 2009 NHTS would have vehicle occupancy data. On Behalf Of Jim Hubbell 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