R help - Jun 2010 - package(pls) - extracting explained Y-variance

Dear R-help users,

I'd like to use the R-package "pls" and want to extract the
explained
Y-variance to identify the important (PLS-) principal components in my  
model, related to the y-data. For explained X-variance there is a  
function: "explvar()". If I understand it right, the summary()  
function gives an overview, where the y-variance is shown, but I can't  
extract it for plotting.

How can I do it, withou pencil and paper?

Thank you very much for help,
Christian

Christian Jebsen <jebsen at rz.uni-leipzig.de> writes:
> Dear R-help users,
>
> I'd like to use the R-package "pls" and want to extract the
explained
> Y-variance to identify the important (PLS-) principal components in my
> model, related to the y-data. For explained X-variance there is a 
function:
> "explvar()". If I understand it right, the summary()  function
gives an
> overview, where the y-variance is shown, but I can't  extract it for
> plotting.
If you look at the summary function (summary.mvr), you will see that it
uses the R2 function for this:

            yve <- 100 * drop(R2(object, estimate = "train", 
                intercept = FALSE)$val)

(For cross-validated or test set validated models, it uses RMSEP.)

-- 
Bj?rn-Helge Mevik