Colleagues, The RVAideMemoire package has a pairwise variance test which one can use to identify variance differences between group levels.
Using the example from this package, pairwise.var.test(InsectSprays$count,InsectSprays$spray), we get this output: Pairwise comparisons using F tests to compare two variances data: InsectSprays$count and InsectSprays$spray A B C D E B 0.7464 - - - - C 0.0187 0.0358 - - - D 0.0865 0.1502 0.5131 - - E 0.0122 0.0173 0.7185 0.3240 - F 0.4693 0.3240 0.0050 0.0173 0.0029 P value adjustment method: fdr Is there a way to graph the pairwise variance differences so that users can easily identify the statistically significant variance differences between group levels? I can do this using Minitab but I'd prefer using R for this. Thomas Subia ______________________________________________ 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.
