[R] Plotting two ellipses in one graph

From: Ali Zanaty <zanaty2005_at_yahoo.com>
Date: Tue, 15 Jun 2010 08:59:50 -0700 (PDT)

Dear R Users:

What I need to do is to plot two ellipses in the same graph (one for each group). You can use either X1 or X2 as the X-axis and the other variable as the Y-axis.

Also I need to show the 95% C.I. or P.I. of the overlapping part of the two ellipses, and for each ellipse separately.

Data can be found at


Thank you so much for your attention to this matter.


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