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.