Produces a scatterplot and adds a smooth curve using the loess fitting method.
USAGE:
scatter.smooth(x, y, span = 2/3, degree = 1, family = c("symmetric",
"gaussian"), evaluation = 50, ...)
REQUIRED ARGUMENTS:
x:
abscissas of points on scatterplot.
y:
ordinates of points 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.
Graphical parameters may also be supplied as arguments
to this function (see par).
SIDE EFFECTS:
produces a scatterplot and adds a smooth curve using
the loess fitting method. The fit is evaluated
at evaluation equally spaced points from min(x)
to max(x) and then graphed by connecting the successive plotting
locations by line segments.