In complement to Dallazuanna's solution, use box.umbrella=list() inside par.settings() to change the default color and line type specification:
bwplot(y~x, data=ex, pch="|", par.settings=list(box.rectangle=list(col="black"), box.umbrella=list(lty=1, col="black")) ) Sincerely. Walmes Zeviani. Lavras - MG, Brasil. ----- ..ooo0 ................................................................................................... ..(....)... 0ooo... Walmes Zeviani ...\..(.....(.....)... Master in Statistics and Agricultural Experimentation ....\_)..... )../.... walmeszevi...@hotmail.com, Lavras - MG, Brasil ............ (_/............................................................................................ -- View this message in context: http://n4.nabble.com/help-with-lattice-boxplots-tp1573781p1573896.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.