I just copy parts of my correspondence with the author of Locfit:
>>Dear Mr <...>,
>>I have tried to apply locfit to a three dimensional data set for
density>>estimation.
>>The algorithm seems to work well but when I want to plot the result,
the>>routine "levelplot" is missing.
>>This is not the case in 2-dimensional fitting.
>>I=B4d be thankful for any help
>>Marcus Eger
> levelplot() is part of the S-plus trellis library, which isn't
available> in R. So to plot the 3-d fit in R, cross-sections have to be computed
> and plotted manually... e.g.
M. Eger
--
+------------------------------------------
| Marcus Eger
| Philipps Universitaet Marburg
| Fachbereich Physik AG Neurophysik
| Renthof 7
| 35032 Marburg
| Tel. +49 6421 284169
| Fax +49 6421 287034
+------------------------------------------
| E-Mail: marcus.eger at physik.uni-marburg.de
+------------------------------------------
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