4 Feb
2011
4 Feb
'11
2:07 p.m.
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Dyann E. Roby
5th Ward City Council Member
www.muscatineiowa.gov
563.299.1700
<mailto:roby@machlink.com> roby(a)machlink.com
161920_128660153862305_5490726_n[1]
From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net]
On Behalf Of Liang.Long(a)dot.gov
Sent: Friday, February 04, 2011 12:08 PM
To: ctpp-news(a)chrispy.net; ctpp-news(a)chrispy.net; ctpp-news(a)chrispy.net
Cc: Pweinberger(a)aashto.org
Subject: RE: [CTPP] "Backing out" MOE
Sorry, I should have said MOE instead of MPO. Here is a more detailed
version of how to calculate MOEs for this derived estimates:
Let's assume there are 3 municipalities
Derived estimate = County total - muni1 - muni2 - muni3
MOE(Derived estimate)=Square root ((County total MOE)**2+(muni1
MOE)**2+(muni2 MOE)**2+(muni3 MOE)**2))
Basically, the appropriate MOE is approximately the square root of the sum
of the individual MOEs squared;
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 <mailto:liang.long@dot.gov> liang.long(a)dot.gov
_____
From: ctpp-news-bounces(a)chrispy.net on behalf of Liang.Long(a)dot.gov
Sent: Fri 2/4/2011 12:42 PM
To: ctpp-news(a)chrispy.net; ctpp-news(a)chrispy.net
Cc: Pweinberger(a)aashto.org
Subject: RE: [CTPP] "Backing out" MOE
Hi, Louis
To calculate the MPO for aggregated count data, you just take the square
root of sum of the squared MOEs for each component estimate.
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 <mailto:liang.long@dot.gov> liang.long(a)dot.gov
_____
From: ctpp-news-bounces(a)chrispy.net on behalf of Louis Pino
Sent: Thu 2/3/2011 3:38 PM
To: 'ctpp-news(a)chrispy.net'
Subject: [CTPP] "Backing out" MOE
Hello-
I am working with the five year ACS data, and we are trying to create
profiles for the unincorporated portions of the county.
My question(s) is: If I sum up the estimates for all the municipalities in
their respective county can I simply take the difference from the county
total and call it the unincorporated part? If so, how do you obtain the MOE
for this number? Can you "back out" the MOE from the adjusted (square root
of the sum)muni MOEs and the county MOE? Or do I have to aggregate block
group data for these areas?
Thanks in advance for your help!
Louis Pino| Socioeconomic Analyst | Customer Resource and Support
Direct 303.480.6000 | Fax 303.480.6790
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