Message-ID: <42819FDA.1050208@yahoo-inc.com>
Date: 2005-05-11T06:02:02Z
From: Hui Han
Subject: density function
In-Reply-To: <Pine.LNX.4.61.0505110627110.27930@gannet.stats>
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.
>