Scatter Plot with Smooth Curve Fitted by Loess

Usage

scatter.smooth(x, y, span=2/3, degree=1,
    family=c("symmetric", "gaussian"),
    xlab=deparse(substitute(x)), ylab=deparse(substitute(y)),
    evaluation=50, ...)
panel.smooth(x, y, span=2/3, degree=1,
    family=c("symmetric", "gaussian"), zero.line=F, evaluation=50, ...)
loess.smooth(x, y, span=2/3, degree=1,
    family=c("symmetric", "gaussian"), zero.line=F, evaluation=50, ...)

Arguments

x x coordinates for scatter plot.
y y coordinates for scatter plot.
span smoothness parameter for loess.
degree degree of local polynomial used.
family if family="gaussian" fitting is by least-squares, and if family="symmetric" a re-descending M estimator is used.
xlab label for x axis.
ylab label for y axis.
zero.line logical for plotting a horizontal line at zero – used for residual plots.
evaluation number of points at which to evaluate the smooth curve.
... graphical parameters.

Description

Plot (scatter.smooth) and add a smooth curve computed by loess to a scatter plot. loess.smooth is an auxiliary function used by the other two.

Value

None.

Author(s)

B.D. Ripley

See Also

loess

Examples

data(cars)
attach(cars)
scatter.smooth(speed, dist)
detach()

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