R help - Apr 2010 - Hat matrix and MSEP

Dear all,
               I have 100 x 5 data matrix and 100 x 1 response vector. I
have calculated Hat matirx and the diagonal of the matrix. Now I want to
know if the diagonals say something about future prediction( Mean square
error for preidiction)? Can I get variance explained for future data?

Thanks alot

-- 
Linda Garcia

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