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 liang.long(a)dot.gov <mailto:liang.long@dot.gov> ________________________________ From: ctpp-news-bounces(a)chrispy.net on behalf of Louis Pino Sent: Thu 2/3/2011 3:38 PM To: &#39;ctpp-news(a)chrispy.net&#39; 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 2008_DRCOG_Email_Bussiness_Card<https://webmail3.dot.gov/exchange/Liang.… SolarSignature <http://solarmap.drcog.org/> Try out DRCOG's new tool to check solar energy savings potential at http://solarmap.drcog.org <http://solarmap.drcog.org/>