Look at the logspline package. This is a different approach to density estimation from the kernel densities used by 'density', but does allow you to set fixed boundaries.
-- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.s...@imail.org 801.408.8111 > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- > project.org] On Behalf Of Farley, Robert > Sent: Monday, July 19, 2010 7:57 PM > To: r-help@r-project.org > Subject: [R] Constrain density to 0 at 0? > > I'm plotting some trip length frequencies using the following code: > > plot( density(zTestData$Distance, weights=zTestData$Actual), > xlim=c(0,10), > main="Test TLFD", > xlab="Distance", > col=6 ) > lines(density(zTestData$Distance, weights=zTestData$FlatWeight), col=2) > lines(density(zTestData$Distance, weights=zTestData$BrdWeight ), col=3) > > which works fine except the distances are all positive, but the > densities don't drop to 0 until around -2 or -3. > > Is there a way for me to "force" the density plot to 0 at 0? > > > > Thanks > > > > Robert Farley > Metro > 1 Gateway Plaza > Mail Stop 99-23-7 > Los Angeles, CA 90012-2952 > Voice: (213)922-2532 > Fax: (213)922-2868 > www.Metro.net > > > > [[alternative HTML version deleted]] > > ______________________________________________ > 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.