[R] Obtaining the cross validation coefficient of determination Hello -

I am currently working through some MLR models and wanted to perform
cross validation
to assess the model's prediction error.  As a Minitab user prior to
discovering R,  I was
able to view the PRESS statistic and the resultant cross validation R^2.
Is there a canned
function already present that does this or should I go ahead and just
right a user defined
function?  

Along the same lines, is there an easy way to extract the Sum of Squares
column from an ANOVA
analysis in order to compute the total sum of squares?

Thanks in advance.

Matt Pietrzykowski

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