[R] Help with dataEllipse function

Michael Friendly friendly at yorku.ca
Fri Apr 26 14:22:23 CEST 2013

On 4/25/2013 8:00 PM, Jana Makedonska wrote:
> Hi Everyone,
> I am working with the R function "dataEllipse". I plot the 95% confidence
> ellipses for several different samples in the same plot and I color-code
> the ellipse of each sample, but I do not know how to specify a different
> line pattern for each ellipse. I can only modify the pattern for all
> ellipses with the "lty" argument. Any help will be highly appreciated.

lty is not an argument of car::dataEllipse, but is passed via ...
So, when you use the groups= argument, only a single value gets used.
You would have to modify the function to allow what you want.

Michael Friendly     Email: friendly AT yorku DOT ca
Professor, Psychology Dept. & Chair, Quantitative Methods
York University      Voice: 416 736-2100 x66249 Fax: 416 736-5814
4700 Keele Street    Web:   http://www.datavis.ca
Toronto, ONT  M3J 1P3 CANADA

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