loess.control
Set Parameters for Loess
Set control parameters for loess
fits.
Usage
loess.control(surface = c("interpolate", "direct"), statistics = c("approximate", "exact", "none"), trace.hat = c("exact", "approximate"), cell = 0.2, iterations = 4, iterTrace = FALSE, ...)
Arguments
 surface
 should the fitted surface be computed exactly
(
"direct"
) or via interpolation from a kd tree? Can be abbreviated.  statistics
 should the statistics be computed exactly, approximately or not at all? Exact computation can be very slow. Can be abbreviated.
 trace.hat
 Only for the (default) case
(surface = "interpolate", statistics = "approximate")
: should the trace of the smoother matrix be computed exactly or approximately? It is recommended to use the approximation for more than about 1000 data points. Can be abbreviated.  cell
 if interpolation is used this controls the accuracy 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 subdivided.  iterations
 the number of iterations used in robust fitting,
i.e. only if
family
is"symmetric"
.  iterTrace
 logical (or integer) determining if tracing
information during the robust iterations (
iterations
$>= 2$) is produced.  ...
 further arguments which are ignored.
Value

A list with components
 surface
 statistics
 trace.hat
 cell
 iterations
 iterTrace with meanings as explained under ‘Arguments’.
See Also
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