Thank you, Jeff. I think I should have been more clear. I don't want to modify my data. I need to create a series of box plots for different sites (north and south in my example but there are many more) but I don't want empty rows in my plot - for years when data was not collected. I tried to make separate plots and join them with grid.arrange and it plots the layout I want but I can't get the boxes in all plots have uniform look (width), see the screenshot: <http://r.789695.n4.nabble.com/file/n4656535/2013-01-24_0949.png>
And thank you for pointing out the shortcomings of my posted data sample. I'll be better prepared next time. -- View this message in context: http://r.789695.n4.nabble.com/How-to-drop-unused-factors-in-faceted-R-ggplot-boxplot-tp4656480p4656535.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.
