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http://en.m.wikipedia.org/wiki/Kernel_density_estimation?wasRedirected=true "Ralf B" <ralf.bie...@gmail.com> wrote: >The density function works empirically based on your data. It makes no >assumption about an underlying distribution. > >Ralf > >On Thu, Jun 24, 2010 at 10:48 PM, Carrie Li <carrieands...@gmail.com> wrote: >> Hello, Ralf, >> >> Sorry I was being clear. >> I mean probability density function >> like normal f(x)=(1/2*pi*sd )*exp(xxxx) something like that . >> Sorry about the confusion >> >> Carrie >> >> On Thu, Jun 24, 2010 at 10:43 PM, Ralf B <ralf.bie...@gmail.com> wrote: >>> >>> Hi Carrie, >>> >>> the output is defined by you; density() only creates the function >>> which you need to plot using the plot() function. When you call >>> plot(density(x)) you get the output on the screen. You need to use >>> pdf() if you want to create a pdf file, png() for creating a png file >>> or postscript if you like ps; there are many others. >>> >>> Ralf >>> >>> On Thu, Jun 24, 2010 at 10:35 PM, Carrie Li <carrieands...@gmail.com> >>> wrote: >>> > Hi everyone, >>> > >>> > I am confused regarding the function "density". >>> > suppose that there is a sample x of 100 data points, and >>> > plot(density(x)) >>> > gives it's pdf ? >>> > or it's more like histogram only ? >>> > >>> > thanks for any answering >>> > >>> > Carrie >>> > >>> > [[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. --------------------------------------------------------------------------- Jeff Newmiller The ..... ..... Go Live... DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. Live Go... Live: OO#.. Dead: OO#.. Playing Research Engineer (Solar/Batteries O.O#. #.O#. with /Software/Embedded Controllers) .OO#. .OO#. rocks...1k --------------------------------------------------------------------------- Sent from my phone. Please excuse my brevity. ______________________________________________ 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.