[R] Plotting Bivariate Normal Data

[John Fox]

Dear Sarah,

If the data are allegedly bivariate normal, then they are probably two
vectors, not one. Assuming that this is the case, I know of nothing quite as
neat as a univariate QQ plot to check visually for bivariate normality
(perhaps someone else has a suggestion here), but you could superimpose
bivariate-normal contours on a scatterplot of the data, perhaps along with a
bivariate density estimate. The car and ellipse packages can do the former,
while the locfit and sm packages (and possibly others) can do the latter.

I hope this helps,
 John

--------------------------------
John Fox
Department of Sociology
McMaster University
Hamilton, Ontario
Canada L8S 4M4
905-525-9140x23604
http://socserv.mcmaster.ca/jfox 
-------------------------------- 

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of sarah english
> Sent: Saturday, October 23, 2004 7:34 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Plotting Bivariate Normal Data
> 
> 
> Dear list 
>  
> I have a vector of values that allegedly have a bivariate 
> normal distribution. 
> 
>  
> 
> I  want to create a plot that shows the values I have 
> obtained, and the  bivariate normal distribution curve for the data.
> 
> 
> Is there a  way of doing this in R? 
> 
> 
>  
> 
> Many thanks for your help, 
> 
> Sarah.
> 
> 
> 
> 		
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