Re: Smooth histograms

[Philipp K. J. <ja...@ie...>]

On Saturday 24 May 2008 00:11, you wrote:
> On Sat, 24 May 2008 01:15:37 +0200, Philipp K. Janert <ja...@ie...>
>
> wrote:
> > I just submitted a patch (1970923) which
> > draws a smooth histogram-like curve
> > for a random collection of points, using
> > a Gaussian kernel density estimation
> > algorithm.
> > Demos are found here:
> > 	www.philipp-janert.com/kdensity
>
> very interesting.
>
> My initial impression on looking at your top left example is that there is
> a phase shift of +half a box in x most visible in the 0.01 and 0.05 plots.
>
 The edge effect is actually in the histogram,
not in the kernel density (yet another advantage
of k-densities over histograms: the annoying
bin-placement problem goes away).

The code does what all current gnuplot
smoothing algos do: they stop at the min
and max data point in the sample. I think
this is reasonable.

Best,

		Ph.