Rcmdr (version 0.9-15)

scatter3d: Three-Dimensional Scatterplots

Description

This function uses the rgl package to draw 3D scatterplots with various regression surfaces.

Usage

scatter3d(x, y, z, xlab=deparse(substitute(x)), ylab=deparse(substitute(y)),
    zlab=deparse(substitute(z)), revolutions=0, bg.col=c("black", "white"), axis.col=NULL,
    surface.col=c("blue", "green", "orange", "magenta", "cyan", "red", "yellow", "gray"), 
    neg.res.col="red", pos.res.col="green", point.col="yellow",
    text.col=axis.col, grid.col=if (bg.col == "white") "black" else "gray", 
    fogtype=c("exp2", "linear", "exp", "none"), 
    residuals=(length(fit) == 1), surface=TRUE, grid=TRUE, df.smooth=NULL, df.additive=NULL,
    sphere.size=1, threshold=0.01, speed=1, fov=60, 
    fit="linear", groups=NULL, parallel=TRUE, model.summary=FALSE)

Arguments

x

variable for horizontal axis.

y

variable for vertical axis (response).

z

variable for out-of-screen axis.

xlab, ylab, zlab

axis labels.

revolutions

number of full revolutions of the display.

bg.col

background colour; one of "white", "black".

axis.col

colour for axes; default is "white" for black background, "black" for white background.

surface.col

vector of colours for regression planes, used in the order specified by fit.

neg.res.col, pos.res.col

colours for lines representing negative and positive residuals.

point.col

colour of points.

text.col

colour of axis labels.

grid.col

colour of grid lines on the regression surface(s).

fogtype

type of fog effect; one of "exp2", "linear", "exp", "none".

residuals

plot residuals (TRUE or FALSE); available only when there is one surface plotted.

surface

plot surface(s) (TRUE or FALSE).

grid

plot grid lines on the regression surface(s) (TRUE or FALSE).

df.smooth

degrees of freedom for the two-dimensional smooth regression surface; if NULL (the default), the gam function will select the degrees of freedom for a smoothing spline by generalized

df.additive

degrees of freedom for each explanatory variable in an additive regression; if NULL (the default), the gam function will select degrees of freedom for the smoothing splines by generalized cross-validation; if a positiv

sphere.size

relative sizes of spheres representing points; the actual size is dependent on the number of observations.

threshold

if the actual size of the spheres is less than the threshold, points are plotted instead.

speed

relative speed of revolution of the plot.

fov

field of view (in degrees); controls degree of perspective.

fit

one or more of "linear", "quadratic", "smooth", "additive"; to display fitted surface(s); partial matching is supported -- e.g., c("lin", "quad").

groups

if NULL (the default), no groups are defined; if a factor, a different surface or set of surfaces is plotted for each level of the factor; in this event, the colours in plane.col are used successively for the points, s

parallel

when plotting surfaces by groups, should the surfaces be constrained to be parallel? A logical value, with default TRUE.

model.summary

print summary or summaries of the model(s) fit (TRUE or FALSE).

Value

• Does not return a useful value; used for its side-effect of creating a 3D scatterplot.

See Also

rgl.open, gam

Examples

data(state)
State.x77 <- as.data.frame(state.x77)
with(State.x77, scatter3d(Income, Murder, Illiteracy))
with(State.x77,  scatter3d(Income, Murder, Illiteracy, fit=c("linear", "quadratic")))