Joining data the way you're doing it is dangerous, Roger Bivand and others describes a standard way to do this process here: http://r-sig-geo.2731867.n2.nabble.com/Merging-shapefiles-and-csv-td7586839.html
And I do an example using US Census data here, using merge(): http://spatialdemography.org/wp-content/uploads/2013/04/9.-Sparks.pdf <http://spatialdemography.org/wp-content/uploads/2013/04/9.-Sparks.pdf> 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 210-458-3166 corey.sparks 'at' utsa.edu coreysparks.weebly.com -- View this message in context: http://r.789695.n4.nabble.com/Plot-by-FIPS-Code-using-Shapefiles-tp4706830p4706840.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
