[R] what "density" is plotting ?

[Jeff Newmiller]

?density

Or

http://en.m.wikipedia.org/wiki/Kernel_density_estimation?wasRedirected=true

"Ralf B" <ralf.bierig at 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 <carrieandstat at 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.bierig at 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 <carrieandstat at 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 at 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 at 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.

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