Smoothing z-values according to their x, y positions
"Emmanuel Levy" <emmanuel.levy at gmail.com> wrote in news:e4654710803191554k4dfc2728g70bde35f41627754 at mail.gmail.com:
Dear Bert,
Thanks for your reply - I indeed saw a lot of functions using:
help.search("smooth")
The problem is that most seem to not be very appropriate to what I'd
like, or they seem extremely complicated (e.g. gma). I am probably
missing something as I don't see how to use Loess. From my poor
understanding, it seems to be for 2D data. Here I want to smooth the
third "z" component.
In the meantime I adapted a function from Greg Warnes, which sort of
does the job (although the smoothing is not very nice).
So I'd be very happy to learn how do do something similar with
loess!
I am realizing that my memories about the kde2d function were faulty. My suggestion would only let you look at the 2-d "marginals". You probably want a true 3d plotting function. The densities would then be closed surfaces. Take a look at Feng and Tierney's figure 10 in this poster at: <http://user2007.org/program/posters/feng.pdf> The code cannot be cut-and-pasted, but if it does what you want, it would be worth it.
David Winsemius