Dear R. Males, This isn't really an R Commander question, since the qqPlot() function is in the car package and is just invoked by the R Commander.
>From ?qqPlot: "distribution: root name of comparison distribution - e.g., "norm" for the normal distribution ... Any distribution for which quantile and density functions exist in R (with prefixes q and d, respectively) may be used." Thus, if there's a qtriangle() and dtriangle(), I suppose that you should be able to get a QQ plot. Further from ?qqPlot: " ... arguments such as df to be passed to the appropriate quantile function." Thus, you should *name* the arguments to be passed to qtriangle() -- perhaps (of course, you should use the correct names) min=3000, max=5000, mode=4000. I hope this helps, John -------------------------------- John Fox Senator William McMaster Professor of Social Statistics Department of Sociology McMaster University Hamilton, Ontario, Canada http://socserv.mcmaster.ca/jfox > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] > On Behalf Of Richard and Barbara Males > Sent: March-08-11 10:49 AM > To: r-help@r-project.org > Subject: [R] R Commander QQ Plot with triangular distribution > > I am attempting to use the R Commander Graphs Quantile-Comparison > functionality on a dataset, to compare with a triangular distribution. > I have the package triangle. My question is on the syntax of how > to specify the parameters of the theoretical distribution in the > Parameters field of the dialog box. For example, the theoretical > distribution has min of 3000, max of 5000, mode of 4000. When I > enter this info as 3000,5000,4000 in the parameters field, I get: > > qqPlot(EmpiricalData$Value, dist="triangle", 3000,5000,4000) > > it produces a plot, but I am not sure that this is correct. > > I have searched for examples, not found anything. Any help much > appreciated. > > R. Males > Cincinnati, Ohio, USA > > ______________________________________________ > 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. ______________________________________________ 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.
