

   SSeett PPaarraammeetteerrss ffoorr LLooeessss

        loess.control(surface=c("interpolate", "direct"),
                      statistics=c("approximate", "exact"),
                      trace.hat=c("exact", "approximate"),
                      cell=0.2, iterations=4, ...)

   AArrgguummeennttss::

    surface: should be fitted surface be computed exactly or
             via interpolation from a kd tree?

   statistics: should the statistics be computed exactly or
             approximately? Exact computation can be very slow.

   trace.hat: should the trace of the smoother matrix be com-
             puted exactly or approximately. It is recommended
             to use the approximation for more than about 1000
             data points.

       cell: if interpolation is used this controls the accu-
             racy of the approximation via the maximum number
             of points in a  cell in the kd tree. Cells with
             more than `floor(n*span*cell)' points are subdi-
             vided.

   iterations: the number if iterations used in robust fitting.

   DDeessccrriippttiioonn::

        Set control parameters for `loess' fits.

   VVaalluuee::

        A list with components

    surface:

   statistics:

   trace.hat:

       cell:

   iterations:

   AAuutthhoorr((ss))::

        B.D. Ripley

   SSeeee AAllssoo::

        `loess'

