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.
[mailto:email@example.com] On Behalf Of Patty Becker
Sent: Sunday, March 22, 2009 4:45 PM
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.
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
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
Things do not look good!
The Federal Register notice
The Real Rules
The 5-year table shells prior to the application of any suppression
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
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(a)umich.edu