Description Details Changes Author(s) References See Also Examples

`p3d`

is a very rough collection of functions to help visualize models
that are expressed as functions of two independent variables with the
addition of a possible categorical variable. It is based on an older version
of `scatter3d`

in the `car`

package by John Fox which, in turn,
uses the `rgl`

package.

The essential idea is provided by the `Plot3d`

function,
which allows plotting a data frame via a formula of the form
`y ~ x + z [| g]`

, where `y`

is the response,
`x, z`

are independent variables and `g`

is an optional
grouping factor. In addition to generating the plot, the function
saves information about the current data frame and graphics parameters
in a globally accessible structure.

Following a call to `Plot3d`

, the following can be done using simple calls:

points can be interactively labeled using `Identify3d`

;

the fitted surfaces for other related
models using the same data can be added using `Fit3d`

graphical annotations that can be represented as a collection of line segments in 3D space
can be added using `Lines3d`

3D data ellipsoids can be added using `Ell3d`

In addition, the package contains a variety of utility functions for working with 2D and 3D models, graphical enhancements and 3D geometry.

Package: | p3d |

Type: | Package |

Version: | 0.02-3 |

Date: | 2011-10-28 |

License: | GPL version 2 or newer |

LazyLoad: | yes |

A simple example below illustrates the major features of `p3d`

.

Lines3d.default: 2009-05-09: disabled line changing 'lwd' to 'size' since 'segments3d' uses 'lwd'.

Georges Monette

Maintainer: Georges Monette <[email protected]>

Monette, G. (1990), Geometry of Multiple Regression and Interactive 3-D Graphics, In Fox, J. & Long, S. (ed.),
*Modern Methods of Data Analysis*, Sage Publications, 209-256.

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