New subject: [CTPP] "Backing out" MOE

4 Feb 2011

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 liang.long(a)dot.gov <mailto: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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RE: [CTPP] "Backing out" MOE