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@chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On
Behalf Of Patty Becker
Sent: Sunday, March 22, 2009 4:45 PM
To: ctpp-news@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:
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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
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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@umich.edu