[R] 3D ellipsoid confidence region

[John Fox]

Dear Melanie,

I think that you're referring to the data.ellipse function in the car
package. What you're suggesting is a nice idea but I haven't done it. I
think that it might be easier to draw the ellipsoid using the rgl
package rather than scatterplot3d. (See, e.g., the scatter3d function
in the Rcmdr package.)

Regards,
 John

On Tue, 28 Jun 2005 12:35:35 -0700
 Melanie Edwards <edwardsm at exponent.com> wrote:
> I am curious if there is code developed to plot confidence regions in
> 3D.
> The scatterplot3d function generates the plot I want, but would like
> an 3D
> equivalent to the data.ellipse function.
> 
> Any help in this direction would be appreciated, be it theoretical,
> graphical, or otherwise.
> 
> Melanie Edwards
> Senior Statistician
> 
> Exponent
> 15375 SE 30th PL, Suite 250
> Bellevue, WA  98007
> Tel:  (425) 519-8714
> Fax:  (425) 643-9827
> Cell:  (206) 852-5739
> www.exponent.com
> 
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--------------------------------
John Fox
Department of Sociology
McMaster University
Hamilton, Ontario, Canada
http://socserv.mcmaster.ca/jfox/