R: Scatter Plot with Smooth Curve Fitted by Loess

scatter.smooth {modreg}

R Documentation

Scatter Plot with Smooth Curve Fitted by Loess

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.

Usage

scatter.smooth(x, y, span=2/3, degree=1,
    family=c("symmetric", "gaussian"),
    xlab=deparse(substitute(x)), ylab=deparse(substitute(y)),
    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.

Value

None.

Author(s)

B.D. Ripley

Examples

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