# scatterplot.matrix

From car v1.0-5
by John Fox

##### Scatterplot Matrices

Scatterplot matrices with univariate displays down the diagonal;
`spm`

is an abbreviation for `scatterplot.matrix`

.
This function just sets up a call to `pairs`

.

- Keywords
- hplot

##### Usage

```
scatterplot.matrix(x, ...)
scatterplot.matrix.formula(formula, data=NULL, subset, ...)
scatterplot.matrix.default(x, labels=colnames(x),
diagonal=c("density", "boxplot", "histogram", "qqplot", "none"),
adjust=1, nclass, plot.points=TRUE, smooth=TRUE, span=0.5, reg.line=lm,
transform=FALSE, ellipse=FALSE, levels=c(.5, .9), robust=FALSE,
groups=FALSE, by.groups=FALSE, col=palette(),
pch=1:n.groups, lwd=1, legend.plot=length(levels(groups)) > 1, ...)
spm(x, ...)
```

##### Arguments

- x
- a data matrix, numeric data frame, or formula.
- formula
- a one-side ``model'' formula, of the form
`~ x1 + x2 + ... + xk`

or`~ x1 + x2 + ... + xk | z`

where`z`

evaluates to a factor or other variable to divide the data into groups. - data
- for
`scatterplot.matrix.formula`

, a data frame within which to evaluate the formula. - subset
- expression defining a subset of observations.
- labels
- variable labels (for the diagonal of the plot).
- diagonal
- contents of the diagonal panels of the plot.
- adjust
- relative bandwidth for density estimate, passed to
`density`

function. - nclass
- number of bins for histogram, passed to
`hist`

function. - plot.points
- if
`TRUE`

the points are plotted in each off-diagonal panel. - smooth
- if
`TRUE`

a lowess smooth is plotted in each off-diagonal panel. - span
- span for lowess smoother.
- reg.line
- if not
`FALSE`

a line is plotted using the function given by this argument; e.g., using`rlm`

in package`MASS`

plots a robust-regression line. - transform
- if
`TRUE`

, multivariate normalizing Box-Cox transformations are computed and plotted; if a vector of powers, one for each variable, these are applied as Box-Cox power transformations prior to plotting. - ellipse
- if
`TRUE`

data-concentration ellipses are plotted in the off-diagonal panels. - levels
- levels or levels at which concentration ellipses are plotted;
the default is
`c(.5, .9)`

. - robust
- if
`TRUE`

use the`cov.trob`

function in the`MASS`

package to calculate the center and covariance matrix for the data ellipse. - groups
- a factor or other variable dividing the data into groups; groups are plotted with different colors and plotting characters.
- by.groups
- if
`TRUE`

, regression lines are fit by groups. - pch
- plotting characters for points; default is the plotting characters in
order (see
`par`

). - col
- colors for points and lines; the default is the
in the current color palette, starting at the
*second*entry (see`palette`

and`par`

). - lwd
- width for lines.
- legend.plot
- if
`TRUE`

then a legend for the groups is plotted in the bottom-right cell. - ...
- arguments to pass down.

##### Value

`NULL`

. This function is used for its side effect: producing a plot.

##### See Also

`pairs`

, `scatterplot`

,
`data.ellipse`

, `box.cox.powers`

,
`box.cox`

, `cov.trob`

.

##### Examples

```
data(Duncan)
scatterplot.matrix(~income + education + prestige | type, data=Duncan)
scatterplot.matrix(~income + education + prestige,
transform=TRUE, data=Duncan)
```

*Documentation reproduced from package car, version 1.0-5, License: GPL version 2 or newer*

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