Click here to see the SAS code.
Click here to see the example.

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Using earthquake data from ...

http://www.scientificamerican.com/article.cfm?id=check-east-coast-earthquake-intenity-by-zip-code

http://earthquake.usgs.gov/earthquakes/dyfi/events/se/082311a/us/cdi_zip.txt


And zipcode boundary data from ...

http://www.census.gov/geo/www/cob/z52000.html

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