I want to thank everyone for their input and assistance. A
great education for me.
After several e-mails it became apparent that what I really
needed was the LEHD data…Again thanks for all you input…very HELPFUL!
From:
ctpp-news-bounces@chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On
Behalf Of Patty Becker
Sent: Friday, March 27, 2009 11:00 AM
To: ctpp-news@chrispy.net
Subject: Re: [CTPP] Question about PUMS data and Geography
Martin,
The 1% and 5% don't exactly refer to geography. They refer to the sampling
fraction; the proportion of the total resondents who are included in the PUMS
files.
PUMS geography is based on PUMAs (Public Use Microdata Sample areas) for the 5%
files; these have to be at least 100,000 population. The 1% file uses
super-PUMAs, which have to be at least 250,000 in population size. Your state
data center should be able to tell you what the PUMAs are for your state or
area; they're also included in the 2000 census PUMS documentation.
Hope this helps.
Patty Becker
At 03:37 PM 3/25/2009, you wrote:
Hello,
I am looking to create some commute flow maps and I think I remember
someone mentioning (between all the please remove me from this list
e-mails) that flow maps can be created by using ACS data and the PUMS
geography. I was at the Census site trying to download the PUMS
geography files and found that there were two types 1% and 5%. Does
anyone know which geography file I should use? The 1% or the 5%?
Thanks in advance,
Martin Catala
GIS Manager
CUTR
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Patricia C. (Patty) Becker
248/354-6520
APB Associates/SEMCC FAX 248/354-6645
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Southfield, MI
48034
pbecker@umich.edu