R help - Jun 2009 - error ellipse

Dear All,

I have a data set with the following structure:

[A], [a], [B], [b]

where [A] and [B] are measurements and [a] and [b] are the associated  
uncertainties. I produce [B]/[A] vs. [A] plots in R and would like to  
show uncertainties  as error ellipses (rather than error bars). Would  
this be relatively easy to do in R?

I would appreciate any help on this
Thanks a lot

Tibi





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On 2009.06.20 16:04:21, Alexandru T Codilean wrote:
> 
> Dear All,
> 
> I have a data set with the following structure:
> 
> [A], [a], [B], [b]
> 
> where [A] and [B] are measurements and [a] and [b] are the associated  
> uncertainties. I produce [B]/[A] vs. [A] plots in R and would like to  
> show uncertainties  as error ellipses (rather than error bars). Would  
> this be relatively easy to do in R?
> 
> I would appreciate any help on this
> Thanks a lot
> 
> Tibi
The car package has an Ellipses function that draws elliptical
confidence intervals for estimated model parameters. It's not exactly
what you want, but the code may help you create your own function.

Cheers,
~Jason

-- 
Jason W. Morgan
Graduate Student
Department of Political Science
*The Ohio State University*
154 North Oval Mall
Columbus, Ohio 43210