Re: [R] density function

From: Hui Han <huihan_at_yahoo-inc.com>
Date: Thu 12 May 2005 - 05:43:54 EST

Thank you so much, Suresh. I searched a lot on "density" among R email archives. Should have searched using "derivative".

Hui

Suresh Krishna wrote:

>
> 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 Thu May 12 05:51:44 2005

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