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)
REQUIRED ARGUMENTS:
x:
abscissas of points to be plotted on scatterplot.
y:
ordinates of points to be plotted on scatterplot.
OPTIONAL ARGUMENTS:
span:
smoothing parameter.
degree:
overall degree of locally-fitted polynomial.
1 is locally-linear fitting and 2 is locally-quadratic fitting.
family:
The values are "gaussian" or
"symmetric". In the first case, local-fitting methods
are used. In the second case, the default, local fitting is used together
with a robustness feature that guards against distortion
by outliers.
evaluation:
number of values at which the loess curve is evaluated.
VALUE:
This is a support routine for panel.smooth and scatter.smooth.
It returns a list of values at which the loess curve is evaluated,
and the corresponding evaluations.