On Fri, 28 Sep 2012, David Winsemius wrote:
bwplot(quant ~ param , data=mg.d, main='Magnesium', ylab='Concentration (mg/L)', subset= era=='Pre-mining' )
David, Don: Thank you. I tried subset= and era== separately, not together. Now I know. Much appreciated, Rich ______________________________________________ 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.
