21 Oct
2005
21 Oct
'05
1:50 p.m.
Bill,
Yes, your points are all well-taken. These are estimates based on the
Census 2000 question, "At what location did you work LAST WEEK?" and the
directions that included the following -- "If you worked at more than one
address or location, give the address or location where you worked most
LAST WEEK". As the types of nontraditional work schedules prevail, we all
will be challenged to estimate what proportion of the workers are affected
by these schedules as well as the proportions that are away from their
usual place of work because of vacation, temporary layoff, illness, etc.
Not easy tasks.
-- Celia G. Boertlein
Journey-to-Work and Migration Statistics Branch
Population Division
U.S. Bureau of the Census
Washington, DC 20233-8800
phone: (301)763-2454
fax: (301)457-2481
email: Celia.G.Boertlein(a)Census.GOV
<William.Banniste
r(a)dot.gov>
To
10/21/2005 11:14 <celia.g.boertlein(a)census.gov>ov>,
AM <edc(a)berwyned.com>
cc
<ctpp-news(a)chrispy.net>et>,
<ctpp-news-bounces(a)chrispy.net>
Subject
RE: [CTPP] Release of Census 2000
Data Product on Daytime Population
Celia,
How would one account for things such as teleworking, flexible work
schedules (such as the one prevalent in the Federal government that
results in workers having a day off every other week), and other
non-traditional work issues in determining the daytime population? As
these types of work schedules become more and more prevalent for
reducing congestion, personal preferences, etc. it would seem that
daytime population estimates would have greater and greater variance.
Bill Bannister
Assistant Director, Office of Advanced Studies
Bureau of Transportation Statistics
Research and Innovative Technology Administration
U.S. Department of Transportation
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celia.g.boertlein(a)census.gov
Sent: Thursday, October 20, 2005 4:20 PM
To: Ed Christopher
Cc: ctpp-news(a)chrispy.net; ctpp-news-bounces(a)chrispy.net
Subject: Re: [CTPP] Release of Census 2000 Data Product on Daytime
Population
Ed,
The Census Bureau's estimate of daytime population only adjusts for
work-related travel, i.e., incommuters to an area and outcommuters from
an
area. Data necessary to adjust for shopping, school, recreation,
tourism,
etc. are not available. Non-workers are assumed to stay within the area
of
their residence.
Counts of workers working in counties (or equivalents) are consistent
with
CTPP counts in Part 2 and the county-to-county worker flow files.
Counts
of workers working in places in the daytime population file are not
fully
consistent with those shown in the CTPP, due to the extended allocation
process used in the CTPP products.
-- Celia G. Boertlein
Journey-to-Work and Migration Statistics Branch
Population Division
U.S. Bureau of the Census
Washington, DC 20233-8800
phone: (301)763-2454
fax: (301)457-2481
email: Celia.G.Boertlein(a)Census.GOV
Ed Christopher
<edc(a)berwyned.co
m>
To
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Subject
Re: [CTPP] Release of Census 2000
10/20/2005 12:28 Data Product on Daytime Population
PM
This is interesting but I wonder how it would compare or relate to CTPP
data. From the posting I am not quite sure what the CB is including as
daytime population. Thinking in CTPP terms I would take what I call
CTPP
Part 2 workers for any given area and add to it some portion of the Part
1
non- workers and then sum them together as my daytime population. Do
you
think this is what the CB did?
Chuck Purvis wrote:
This is a message sent to the State Data Center
listserv this morning,
10/20/05:
FROM THE DESK OF STANLEY J. ROLARK
CHIEF, CUSTOMER LIAISON OFFICE
October 20, 2005
Subject: Release of Census 2000 Data Product on
Daytime Population
The Census Bureau will be releasing later today or tomorrow, Census
2000
data on the daytime population. The data are being released for all
counties (or co. equivs.) by state in the U.S. There are also subtotal
lines for each state and for the U.S. as a whole. There are data for
the
municipios in Puerto Rico, and a total for Puerto Rico.
There are data for places (incorp. and CDPs) in the U.S. by state, but
no
place data for Puerto Rico. The universe is places with either 2,500
workers living in the place or 2,500 workers working in the place.
There will be three separate Excel files. They will be accessible
through
the Subjects A to Z index, from a link entitled Daytime Population.
Table 1 is a summary for places by size. All places > 250,000 are
shown,
in three size classes. Places less than 250,000 are shown in six
size
classes, but only the first twenty based on percent increase in
daytime
pop are shown for each size in Table 1.
Table 2 shows all counties by state in the U.S. and Puerto Rico.
Table 3 shows places with 2,500 workers living in or working in, by
state, for the U.S. (not PR).
The data product was developed by the Journey to Work and Migration
Statistics Branch in Population Division. The data were developed by
combining the Census 2000 data on the residence population with the
Census
2000 sample data on place of work. The estimates of daytime population
to
be released by the Census Bureau only adjust resident populations for
travel into or out of an area for work purposes. No adjustment is made
for
travel to school, shopping, recreation, tourism, health care or for
any
other trip purpose. The data sources required for making these
adjustments
are not available on a consistent, nationwide basis. Furthermore, the
adjustments to resident population reflected in these "daytime"
population
estimates do not take the time of day work trips are made into
account.
The
simplifying assumption is made that all workers leave the area in the
morning and return to the area in the evening.
The release will include data items on the number of workers working
in
the
area, the number of workers living in the area, the estimated daytime
population, the number and percent change due to commuting, the number
and
percent of the workers who lived in the area that also worked in the
area,
and the employment-residence ratio (workers working in/workers living
in).
The data are likely to be released with a press release but with no
press
embargo. While you will be receiving a copy of the press release as
part
of our normal procedures, I did want to provide you with a "heads
up" about
this release as you may receive questions and/or have an interest in
this
release. Census Bureau contact information regarding this release
will
be
included at the top of the press release.
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--
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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