While group quarters may not make up a substantial portion of the population in some areas they do elsewhere, particularly in military or college towns. In some cases this can make up more than 30 percent of the population in the urbanized area and have a large impact on the transportation network. Good, detailed information will be vital to developing good transportation network analysis. From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Patty Becker Sent: Sunday, March 22, 2009 4:45 PM To: ctpp-news(a)chrispy.net Subject: Re: [CTPP] 5-year ACS data I share Ed's concern over the impact of these rules, although some of them are the result of the switch to the ACS itself. The way the Census samples group quarters for inclusion in the ACS prohibits low level geography reporting for them. We'll be lucky to get anything meaningful by county. However, we will get the SF1 and SF2 tables from the 2010 census itself, so at least we will know where the GQ are, the type, and the population in them, by block. (See Table P37 in the 2000 SF1.) I would submit that, for the most part, people who live in GQ are not very active in terms of using the transportation network, in any event. The basic rule that there will be suppression in tables with more than 100 cells calls for a major rewrite of the table structure itself--for everyone, not just the CTPP community. For example, right now getting the unemployment rate requires you to use a table with more than 100 cells. This needs to be fixed by adding a simple table showing labor force status, maybe by sex, but definitely not by age. This will result in a smaller table and there will be no suppression. I'm sure that many of you can find your favorite examples of this problem. In your responses to the FR notice, please emphasize the need to redo the detailed table structure. That's the only way we're going to get any semblance of the data we need. Patty Becker At 03:35 PM 3/20/2009, you wrote: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from 8bit to quoted-printable by ryoko.chrispy.net id n2KJZJI6014332 Now that dust has settled maybe we can get on with the order of the day. On March 6th the Census Bureau published a notice in the Federal Register asking for comments on the 5-year ACS data products. As part of the notice the users were given a set of rules that will establish data availability. Did you know that NO Block Group data will be available for Group Quarters (Rule 1)? Or that all Block Group and most Tract data for "Means of Transportation to Work" crossed with any variable, even Sex will NEVER be available? (Rule 7). Attached is an analysis of the impact of Rule 7 using some information gathered through our CTPP development efforts. Things do not look good! The Federal Register notice http://www.census.gov/acs/www/Downloads/FedRegNotice_E9-4803.pdf The Real Rules http://www.census.gov/acs/www/Downloads/proposal_acs5yearproducts.pdf The 5-year table shells prior to the application of any suppression rules http://www.census.gov/acs/www/Products/users_guide/ although the website says it applies to 2005-2007 ACS data these are the same tables for the 5-year data according to the Census Bureau -- Ed Christopher 708-283-3534 (V) 708-574-8131 (cell) FHWA RC-TST-PLN 19900 Governors Dr Olympia Fields, IL 60461 _______________________________________________ ctpp-news mailing list ctpp-news(a)chrispy.net http://www.chrispy.net/mailman/listinfo/ctpp-news ------------------------------------------------------------------------ ------------------------- 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