R help - Apr 2013 - Help with dataEllipse function

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.

Thanks in advance!
Jana

-- 


Jana Makedonska,
B.Sc. Biology, Universite Paul Sabatier Toulouse III
M.Sc. Paleontology, Paleobiology and Phylogeny, Universite de Montpellier II
Ph.D. candidate in Physical Anthropology and Part-time lecturer
Department of Anthropology
College of Arts & Sciences
State University of New York at Albany
1400 Washington Avenue
12222 Albany, NY
Office phone: 518-442-4699
http://electricsongs.academia.edu/JanaMakedonska

	[[alternative HTML version deleted]]

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

Dear Jana,

The lty argument to dataEllipse() (in the car package) isn't vectorized. It
could be, and I'll add that as a feature request. Actually, lty isn't an
explicit argument to dataEllipse(); it's simply passed through to the
lines() function, which draws the ellipses.

You should be able to do what you want by adding the ellipses one at a time to
your plot (see the argument add in ?dataEllipse) or by using the coordinates of
the ellipses, returned by dataEllipse(), to a customized graph.

I hope that this helps,
 John

------------------------------------------------
John Fox
Sen. William McMaster Prof. of Social Statistics
Department of Sociology
McMaster University
Hamilton, Ontario, Canada
http://socserv.mcmaster.ca/jfox/
	
On Thu, 25 Apr 2013 20:00:20 -0400
 Jana Makedonska <jmakedonska at gmail.com> 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.
> 
> Thanks in advance!
> Jana
> 
> -- 
> 
> 
> Jana Makedonska,
> B.Sc. Biology, Universite Paul Sabatier Toulouse III
> M.Sc. Paleontology, Paleobiology and Phylogeny, Universite de Montpellier
II
> Ph.D. candidate in Physical Anthropology and Part-time lecturer
> Department of Anthropology
> College of Arts & Sciences
> State University of New York at Albany
> 1400 Washington Avenue
> 12222 Albany, NY
> Office phone: 518-442-4699
> http://electricsongs.academia.edu/JanaMakedonska
> 
> 	[[alternative HTML version deleted]]
> 
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