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Bill=2C It seems to be 'character' - odd...! > str(int1901$Latitude) =A0chr [1:61537] "5.75" "6.25" "6.75" "7.25" "7.75" "8.25" ... Thanks again=2C Steve > What does str(int1901) show to be the type for Latitude? (I'm guessing > it's a factor.) > > -- > > David Winsemius=2C MD > Heritage Laboratories > West Hartford=2C CT > =20 ______________________________________________ R-help@r-project.org mailing list 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.