Hi, If you read French, you might find the following discussion interesting,
http://www.forum.math.ulg.ac.be/viewthread.html?id=45765 It contains some good suggestions to project an ellipsoid onto a plane, which as I understand might be related to your question. HTH, b. On 8 February 2012 07:29, Samuel Bazzi <sba...@ucsd.edu> wrote: > I have a 3xN matrix of parameters obtained from N regressions where the 3 > parameters are jointly statistically significant. I would like to reproduce > a 3D confidence ellipsoid projecting 2D ellipses onto the XY plane as in > Figure 5.2 in this > text<http://books.google.com/books?id=PMeJGeXA09EC&pg=PA172&dq=confidence+ellipsoid&hl=en&sa=X&ei=oWQxT4OgBYLSiALW85WtAw&ved=0CEIQ6AEwAg#v=onepage&q=confidence%20ellipsoid&f=false> > . > > Is this possible using some combination of ellipse3d() and ellipse()? Any > insights would be greatly appreciated. > > Thanks. > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.