# 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`

$\ge 2$) 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

*Documentation reproduced from package stats, version 3.3, License: Part of R 3.3*

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