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
familyis"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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