Dear CTPP Community,
This is an opportunity for
your input on the upcoming CTPP based on 5-year ACS 2006-2010!
This message contains
colored highlighting, if you cannot see it, please view the message in HTML (if
possible).
Please download the attached
spreadsheet, mark it as appropriate according to the instructions and
information below, and return it attached to an email directly to me by Friday,
May 7th, 2010 pweinberger@aashto.org
(Please do not reply to the whole list with
your marked attached spreadsheet, for that will create a version control
nightmare!)
The attached spreadsheet is
a proposed table list to submit to the Census Bureau for special tabulations
based on the 5-year ACS, it is derived from the Census Bureau’s
Disclosure Review Board’s approved CTPP from 3-year ACS data table list.
For large area geography, we
plan to keep the table list the same as the current 3-year table list (the
spreadsheet, as if there were no highlighting).
For small
area geography (tract, TAZ, and block group), we are proposing to eliminate
many of the tables with 3-way cross-tabulations, or 2-way cross-tabulations
with more than 40 cells because we suspect they will contain very little or no
data. We have highlighted the tables proposed for deletion at small
geography in BLUE. Please identify any highlighted tables you feel are
important to keep, and not be eliminated by placing a mark in the specified column
and row.
Alternatively, if you see
tables that are not marked for deletion at small geography please feel free to
let me know there is no need for those tables, it would be a waste of resources
to generate data that is essentially useless to the transportation planning
community.
The
number of classifications in each variable may need to be reduced to pass the
CB’s criteria and some of those tables have been highlighted in pink, we
are including this information to start thinking about the ways variable groups
can collapse.
For the ACS 2006-2010
five-year data and the 2010 Census Tracts, there is projected to be, on
average, a little over 4000 residents per tract, and approximately 120
household records and 150 worker records in the unweighted sample.
The 5-year data has no lower bound for place
size. Tables that include Means of Transportation still require 3
unweighted records per each category of Means of Transportation category to
avoid suppression. There is no rule yet in place for maximum number of
cells per table, a number has been discussed, but not decided upon.
If you have questions please do not hesitate to
email them to me.
Thanks in advance for your help!
Penelope Weinberger
CTPP Program Manager
AASHTO
202-624-3556
http://ctpp.transportation.org/home/default.htm
It's just as bad to not make a plan as to blindly follow the
one you already have.