The sm package (by Adrian Bowman and Adelchi Azzalini) implements a
variety of nonparametric smoothing techniques, centred on nonparametric
regression for one or two covariates and density estimation for up to
three variables. A new version of the package is now available on CRAN.
In an earlier unannounced version (2.1), a variety of methods of
bandwidth
selection were added, with default settings to allow particularly simple
function calls.
In the new version (2.2), interactive control panels are available for
the main functions (sm.regression and sm.density), using the rpanel
package
(which itself is based on tcltk). In addition, the rgl package is used
to provide rotatable three-dimensional plots, where these are
appropriate.
The details of how these functions operate are available in the help
files
(including the help file for sm.options) and in the examples. However,
the broad principle is that a control panel is activated by adding the
argument
panel = TRUE
and an rgl plot is created by adding the argument
display = "rgl"
Adrian Bowman
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