30 Dec
2009
30 Dec
'09
10:45 a.m.
I'm compiling some comparisons of 2006-08 ACS and 2000 Census data, and I'm
looking for some guidance in estimating standard errors for 2000 CTPP
tables. For the place of residence data, I have applied the estimation
procedures outlined in the 2000 SF3 documentation:
Unadjusted standard error:
SE(Y) = sqrt(5*Y*(1-Y/N)),
where N = size of publication area (total population) and Y = estimate
of characteristic total
This value is then multiplied by a design factor determined by the state,
sample rate and characteristic.
Are these methods also applicable to the workplace (CTPP part 2) tables? If
so, what assumptions can I make about sample rates, and are the standard
error design factors applicable to place of work statistics?
Any advice will be greatly appreciated.
----------------------------------------------------
Paul Reim
Chief Planner, Data Resources
Central Transportation Planning Staff
Boston Metropolitan Planning Organization
10 Park Plaza, Suite 2150
Boston, MA 02116-3968
Phone: (617) 973-8132
Fax: (617) 973-8855
30 Dec
30 Dec
12:31 p.m.
Please remove me from your E-mail list, I retire Dec. 31, 2009
Donald A. Bubb, P.E; Chief
Transportation Planning and Traffic Engineering
York County Planning Commission
28 E. Market Street I York, Pa. 17401
Phone: 717.771.9870 I Fax: 717.771.9511
www.dbubb@ycpc.org
From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net]
On Behalf Of Paul Reim
Sent: Wednesday, December 30, 2009 11:45
To: CTPP-News
Subject: [CTPP] estimating standard errors for 2000 CTPP data
I'm compiling some comparisons of 2006-08 ACS and 2000 Census data, and I'm
looking for some guidance in estimating standard errors for 2000 CTPP
tables. For the place of residence data, I have applied the estimation
procedures outlined in the 2000 SF3 documentation:
Unadjusted standard error:
SE(Y) = sqrt(5*Y*(1-Y/N)),
where N = size of publication area (total population) and Y = estimate
of characteristic total
This value is then multiplied by a design factor determined by the state,
sample rate and characteristic.
Are these methods also applicable to the workplace (CTPP part 2) tables? If
so, what assumptions can I make about sample rates, and are the standard
error design factors applicable to place of work statistics?
Any advice will be greatly appreciated.
----------------------------------------------------
Paul Reim
Chief Planner, Data Resources
Central Transportation Planning Staff
Boston Metropolitan Planning Organization
10 Park Plaza, Suite 2150
Boston, MA 02116-3968
Phone: (617) 973-8132
Fax: (617) 973-8855
2:15 p.m.
Liang meant to post this to the whole list...
---------------------------
Hi, all
When we apply the methods to workplace tables, we don't have N, size of
publication area. A statistician from CB suggested it was best to just
to use the Residence Population as the N as they had nothing else with
which to base a calculation on. This is not ideal method, as for some
places, there are many more workers than total resident workers, such as
D.C.
The same thing happens to the design factor. As we don't have design
factor for the workplace tables, we can only use factors from residence
population.
Hope this helps.
Liang Long
Federal Highway Administration
Room 74-440
1200 New Jersey, SE
Washington, DC 20590
tel 202 366 6971
fax 202 493 2198
e-mail liang.long(a)dot.gov <mailto:liang.long@dot.gov>
Paul Reim wrote:
I'm compiling some comparisons of 2006-08 ACS and
2000 Census data, and I'm
looking for some guidance in estimating standard errors for 2000 CTPP
tables. For the place of residence data, I have applied the estimation
procedures outlined in the 2000 SF3 documentation:
Unadjusted standard error:
SE(Y) = sqrt(5*Y*(1-Y/N)),
where N = size of publication area (total population) and Y = estimate
of characteristic total
This value is then multiplied by a design factor determined by the state,
sample rate and characteristic.
Are these methods also applicable to the workplace (CTPP part 2) tables? If
so, what assumptions can I make about sample rates, and are the standard
error design factors applicable to place of work statistics?
Any advice will be greatly appreciated.
----------------------------------------------------
Paul Reim
Chief Planner, Data Resources
Central Transportation Planning Staff
Boston Metropolitan Planning Organization
10 Park Plaza, Suite 2150
Boston, MA 02116-3968
Phone: (617) 973-8132
Fax: (617) 973-8855
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2 comments
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Paul Reim