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| Subject: | Re: [gislist] Census comparisons? |
| Date: |
05/29/2007 04:08:37 PM |
| From: |
Quantitative Decisions |
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At 12:07 AM 5/28/2007 -0700, Ryan Gauvey wrote:
>I am trying to figure out the best way to deal with the changing
>geographic borders of census tracts. My analysis is from 1980-2000, at the
>tract level.
You need Census tract equivalency files. The US Census Bureau produces
them at the tract level and above beginning in 1980 and block level and
above beginning in 1990. They are reproduced by third parties, such as
Geolytics, but a good public (free) source is the archived
"MABEL/GeoCorr90" page at http://mcdc2.missouri.edu/websas/geocorr90.shtml
. You will probably have to repeat the procedure going from 1990 to 2000
in order to obtain the 1980 to 2000 correspondences: the site is at
http://mcdc2.missouri.edu/websas/geocorr2k.html ("GeoCorr2K").
Cheers,
Bill Huber
Quantitative Decisions
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