| % File src/library/stats/man/loess.control.Rd |
| % Part of the R package, https://www.R-project.org |
| % Copyright 1995-2015 R Core Team |
| % Distributed under GPL 2 or later |
| |
| \name{loess.control} |
| \title{Set Parameters for Loess} |
| \usage{ |
| loess.control(surface = c("interpolate", "direct"), |
| statistics = c("approximate", "exact", "none"), |
| trace.hat = c("exact", "approximate"), |
| cell = 0.2, iterations = 4, iterTrace = FALSE, \dots) |
| } |
| \alias{loess.control} |
| \arguments{ |
| \item{surface}{should the fitted surface be computed exactly |
| (\code{"direct"}) or via interpolation from a kd tree? Can be abbreviated.} |
| \item{statistics}{should the statistics be computed exactly, |
| approximately or not at all? Exact computation can be very slow. |
| Can be abbreviated.} |
| \item{trace.hat}{Only for the (default) case \code{(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.} |
| \item{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 \code{floor(n*span*cell)} points are subdivided.} |
| \item{iterations}{the number of iterations used in robust fitting, |
| i.e. only if \code{family} is \code{"symmetric"}.} |
| \item{iterTrace}{logical (or integer) determining if tracing |
| information during the robust iterations (\code{iterations}\eqn{\ge |
| 2}{>= 2}) is produced.} |
| \item{\dots}{further arguments which are ignored.} |
| } |
| \description{ |
| Set control parameters for \code{loess} fits. |
| } |
| \value{ |
| A list with components |
| \item{surface}{} |
| \item{statistics}{} |
| \item{trace.hat}{} |
| \item{cell}{} |
| \item{iterations}{} |
| \item{iterTrace}{} |
| with meanings as explained under \sQuote{Arguments}. |
| } |
| \seealso{\code{\link{loess}}} |
| \keyword{smooth} |
| \keyword{loess} |