[R] Plot by FIPS Code using Shapefiles

Corey Sparks corey.sparks at UTSA.EDU
Tue May 5 18:07:35 CEST 2015

Joining data the way you're doing it is dangerous, Roger Bivand and others
describes a standard way to do this process here:

And I do an example using US Census data here, using merge():

look at page 134 of that pdf.

Hope this helps

Corey Sparks, PhD
Assistant Professor
Department of Demography
University of Texas at San Antonio
501 West César E. Chávez  Blvd 
Monterey Building 2.270C
San Antonio, TX 78207
corey.sparks 'at' utsa.edu
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