Brian—

You are correct: Not every ACS Base table is available for BGs.

BGs are the smallest level of geog in ACS. And some of Base tables may not be published at the BG level for two reasons: (1) estimates reliability concerns; (2) sensitivities about certain topics (poverty, citizenship status…).

These data *are* available for Tracts.  So, if one really needed such data at the BG level, you could figure out marginal distributions for the Tract, and then evaluate whether the marginals can be assigned down to the member Block Groups.

Todd Graham Principal Forecaster  |  Metropolitan Council   |  Regional Policy and Research todd.graham@metc.state.mn.us P. 651.602.1322  |  F. 651.602.1674 390 North Robert Street  |  St. Paul, MN 55101  |  metrocouncil.org/data

From: ctpp-news-bounces@chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Brian Chenault
Sent: Friday, February 15, 2013 2:36 PM
To: ctpp-news@chrispy.net
Subject: [CTPP] ACS 5-year Estimates

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@hrpdcva.gov | http://www.hrtpo.org | Phone: 757.420.8300 | Fax: 757.523.4881