2 Oct
2008
2 Oct
'08
11:58 a.m.
You're right, it would be confusing to have 2006 refer to both a one
year number and a 3 year number.
--Bob
Robert L. Campbell,
Senior Manager/Scheduling
MTA Long Island Bus
Phone 516-296-4709
FAX 516-794-8670
>> ed christopher <edc(a)berwyned.com>
10/2/08 11:36:32 AM >>>
Robert--I would not call the 2005-2007 ACS data
2006. It will become
to
confusing with the annual ACS data for the areas over 65K. Right now
in
Census terminology the 2005 to 2007 data is call a period estimate and
in
fact items like income are adjusted and brought forward to 2007. I
don't
know what to call the multi-year period estimates but to call them a
single
year without noting that they are not a single year would be
misleading.
Right now all I can think of is to call them something like 2007-3 for
this
year, 2008-3 next year and so on. Come 2010 we will have ACS 2010,
ACS
2010-3 and ACS 2010-5 (for the five year.)
Robert Campbell wrote:
I would design the look of the 3-year and again the
5-year
tabulations
to have a slightly different appearance to help remind
us which year
or
set of years we are looking at. This is a visual
thing, not a data
thing. A different shade of blue. Different highlighting or font
for
the years involved, etc.
Will the 2005-2007 3 year set always show up every page that way
("2005-2007"). The central data year will be 2006 — if I average
the
current 2005 to 2007 data, I might be well tempted to
call it 2006
data,
to dispell thinking that it is more current than it
really is.
Robert L. Campbell,
Senior Manager/Scheduling
MTA Long Island Bus
Phone 516-296-4709
FAX 516-794-8670
>>> "Murakami, Elaine" <Elaine.Murakami(a)fhwa.dot.gov> 10/1/08
5:17:38
PM >>>
Hi Everyone -
I bet you have a lot of questions about CTPP using the first 3 years
of
ACS and TAZs, but unfortunately, I can't answer them yet!
Given the current uncertainty of the next CTPP ("custom tabulation")
using the ACS, we are moving forward to develop products using
standard
ACS products. Some of you will recall that we created a series
using
the first 2005 ACS data products. They are posted on
both the FHWA
web
http://www.fhwa.dot.gov/planning/census/2005tpoverview.htm and on
the
AASHTO web
http://ctpp.transportation.org/
On December 9, 2008, the Census Bureau plans to release the first
3-year
ACS products (surveys completed in 2005, 2006 and 2007). The
minimum
population threshold is 20,000 for the 3-year
products, compared to
65,000 population for the ACS 1-year products. So, while the data
is
still "swiss cheese," that is, geographic
coverage has holes, a lot
more geographic units will be available. The results are still
subject
to the Census Bureau rules of "collapsing and filtering" which means
that sometimes the data have been suppressed and you will see an
"N".
We are now designing new profile sheets, in which we plan to include
data from 2000 (using Census Summary File 3 and CTPP2000) and from
2005-2007 ACS. Please let me know if you have any recommendations
for
specific tables to include (the data must be available in both 2000
and
from the 2005-2007 ACS). One recommendation from Nathan Erlbaum
(NYS
DOT) is to create a spreadsheet macro that will sum up multiple
geographic units and re-calculate the Margin of Error (using the
materials on Page 96-98 in NCHRP Report 588).
Also, I am wondering if there is any interest in an updated "Journey
to
Work Trends" report to include the 2005-2007 ACS results.
http://www.fhwa.dot.gov/ctpp/jtw/index.htm This report was limited
to
metropolitan areas with population over 1 million, but
had trend
data
including 1960, 1980, 1990 and 2000. Because of
redefinitions of
metropolitan areas by OMB, the data need to be accumulated from
county
records for historic
al comparability, which
makes for quite a bit of
work. The last report used the 1999 definition, but
the 2005-2007
ACS
data will be reported using the 2007 OMB definitions (I think). My
question for you is: is this report useful enough to spend time and
resources on?
Thanks in advance for your opinions.
Elaine Murakami
FHWA Office of Planning (Wash DC)
206-220-4460 (in Seattle)
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--
Ed Christopher
FHWA Resource Center
19900 Governors Drive
Olympia Fields, Illinois 60461
708-283-3534 (v) 708-283-3501 (f)
708-574-8131 (cell)
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