Try x <- mean(PCA$scores[,1]) and y <- mean(PCA$scores[,2]) which should be

the same as x <- 0, y <- 0 within rounding error.

----------------------------------------------

David L Carlson

Associate Professor of Anthropology

Texas A&M University

College Station, TX 77843-4352

> -----Original Message-----

> From:

[hidden email] [mailto:r-help-bounces@r-

> project.org] On Behalf Of mary

> Sent: Tuesday, January 22, 2013 3:40 AM

> To:

[hidden email]
> Subject: Re: [R] Ellipse in PCA with parameters "a" and "b"defined.

>

> Ok...

> so, in my model my "a" is built using the standard deviation of the

> first

> principal component and "b" with the second, so my "x" and "Y" should

> be :

> PCA $ scores [, 1], PCA $ scores [, 2]

> but in this way I do not get out a confidence interval set on my

> parameters

> but many ellipses.

>

> Thanks

> Mary

>

>

>

> --

> View this message in context:

http://r.789695.n4.nabble.com/Ellipse-in-> PCA-with-parameters-a-and-b-defined-tp4656215p4656242.html

> Sent from the R help mailing list archive at Nabble.com.

>

> ______________________________________________

>

[hidden email] mailing list

>

https://stat.ethz.ch/mailman/listinfo/r-help> PLEASE do read the posting guide

http://www.R-project.org/posting-> guide.html

> and provide commented, minimal, self-contained, reproducible code.

______________________________________________

[hidden email] mailing list

https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide

http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.