Re: [R] density function

From: Suresh Krishna <ssk2031_at_columbia.edu>
Date: Wed 11 May 2005 - 16:38:51 EST

http://finzi.psych.upenn.edu/R/Rhelp02a/archive/20509.html

-s.

Hui Han wrote:
> Thank you very much, Professor Ripley.
>
> If possible, could you point me to other packages that you think I
> should look at for estimating a derivative?
>
> Best regards,
> Hui
>
> Prof Brian Ripley wrote:
>
>> On Tue, 10 May 2005, Hui Han wrote:
>>
>>> I wonder if the function "density" outputs the gaussian mixture
>>> formula that is estimated from the input data, assuming a gaussian
>>> model is used at each data point ? I want to take the derivative of
>>> the finally estimated gaussian mixture formula for further analysis.
>>
>>
>>
>> It is a kernel density estimate: a rather trivial mixture, not
>> necessarily Gaussian. Also, it is not set up to optimally estimate a
>> derivative, and you should look at more sophisticated methods in other
>> packages if you want to do that.
>>
>> As to what "density" outputs: see its help page.
>>
>
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R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed May 11 16:48:32 2005

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