My recommendation is to use Table H13 (household size from 1 to 7+ persons) from the 2010 Census. Then, use IPF to adjust the CTPP table (Table A112208 – Household Size (5) by Household Income (26)) which uses 2006-2010 ACS records, to match the Census-based hhld size distribution. The CTPP table has 5 categories for household size, but the categories are: total, 1, 2, 3, and 4+ persons. If you don’t need the 25 income categories, you might want to use A112208C, which only has 8 income categories (total and 8 categories). The “C” in the table stands for “compressed”. Elaine Murakami FHWA Office of Planning 206-220-4460 (in Seattle) From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net] On Behalf Of Geoff Olson Sent: Thursday, January 02, 2014 6:59 AM To: 'ctpp-news(a)chrispy.net' Subject: [CTPP] Census 2010 vs 5-year ACS for TAZs Hello Everyone, Ive gotten started on our long range transportation plan, and one area we have an issue with is Census data. We've got 2010 Census data for our population and household counts, but we will also need the 5-year ACS data of number of households by household size by household income. We would prefer to use 2010 population counts for the base year of the model so we've decided there are two options. We could use the 5-year ACS data for our base model year population and household counts, but that doesn't create a true picture of 2010. The other option is we could mix datasets and proportionately apply characteristics of the 5-year ACS data to the 2010 counts. Can anyone give us some guidance needing to use both datasets on the same project? Thank you, Geoff Olson Transportation Planner Bi-State Regional Commission 1504 3rd Ave. P.O. Box 3368 Rock Island, IL 61204 ________________________________ This email and all attachments are intended only for the listed recipient(s). This message may contain confidential or privileged information only for use by the listed recipient(s). Do not forward, post or otherwise disclose the contents of this email without the permission of the sender. If you received this message in error, please delete it and notify the sender immediately. Bi-State Regional Commission accepts no responsibility for any damages caused by this message, including those related to viruses or malware.