Message-ID: <4281A87B.6040702@columbia.edu>
Date: 2005-05-11T06:38:51Z
From: Suresh Krishna
Subject: density function
In-Reply-To: <42819FDA.1050208@yahoo-inc.com>
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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