Re: [R] calculating/plotting error ellipses

2007-09-25 Thread Prof Brian Ripley
On Tue, 25 Sep 2007, Jan M. Wiener wrote: > Hello, > thank you very much for the quick answer. > This works well. it draws a nice ellipse in the right orientation. > However, I doubt that the ellipse represents the 95% confidence > interval, even if that is the standard-parameter for level is .95

Re: [R] calculating/plotting error ellipses

2007-09-25 Thread Jan M. Wiener
Hello, thank you very much for the quick answer. This works well. it draws a nice ellipse in the right orientation. However, I doubt that the ellipse represents the 95% confidence interval, even if that is the standard-parameter for level is .95. The ellipse surely is to large? Any further help wo

Re: [R] calculating/plotting error ellipses

2007-09-24 Thread bbolker
Jan M. Wiener wrote: > > hello, > sorry for posting what may be a simple question: > i do have a matrix of coordinates (positional judgments, see below) and > now want to calculate and plot the corresponding error ellipse. > can anyone help me with the exact steps/syntax? > Something along th

[R] calculating/plotting error ellipses

2007-09-24 Thread Jan M. Wiener
hello, sorry for posting what may be a simple question: i do have a matrix of coordinates (positional judgments, see below) and now want to calculate and plot the corresponding error ellipse. can anyone help me with the exact steps/syntax? > xyDat X Y 1-0.49-2.13 2

[R] calculating/plotting error ellipses

2007-09-24 Thread Jan M. Wiener
hello, sorry for posting what may be a simple question: i do have a matrix of coordinates (positional judgments, see below) and now want to calculate and plot the corresponding error ellipse. can anyone help me with the exact steps/syntax? > xyDat X Y 1-0.49-2.13 2