loess.smooth
Smooth Loess Curve
Description
Returns a list of values at which the loess curve is evaluated.
Usage
loess.smooth(x, y, span = 2/3, degree = 1, family = c("symmetric",
"gaussian"), evaluation = 50, ...)
Arguments
| x |
abscissas of points to be plotted on scatterplot.
|
| y |
ordinates of points to be plotted on scatterplot.
If a point has NA for either coordinate,
it will be omitted from the calculations.
|
| span |
the smoothing parameter.
|
| degree |
the overall degree of the locally-fitted polynomial.
1 is locally-linear fitting and 2 is locally-quadratic fitting.
|
| family |
the value is "gaussian" or
"symmetric".
- If "gaussian", local-fitting methods
are used.
- If "symmetric" (the default), local fitting is used together
with a robustness feature that guards against distortion
by outliers.
|
| evaluation |
the number of values at which the loess curve is evaluated.
|
| ... |
additional arguments to be passed to loess.control.
|
Value
returns a list with two components:
| x |
the x values at which the loess curve was evaluated.
|
| y |
the smoothed values.
|
See Also
Examples
x <- runif(100, -3, 3)
eps <- rnorm(100, 0, .1)
y <- sin(x) + eps
loess.smooth(x, y, span = 0.5, degree = 2)