[R] density function

Suresh Krishna ssk2031 at columbia.edu
Wed May 11 08:38:51 CEST 2005



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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