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\(\ge 2\)) is produced.- …
further arguments which are ignored.
Value
A list with components