On Sun, Feb 24, 2013 at 04:32:05PM -0500, Ronnie Ghose wrote:
> On Thu, Jan 24, 2013 at 11:50 AM, Flavio Vinicius <flavio...@gmail.com> wrote:

>     I think you can only guarantee that R2 is always positive when
>     performing linear regression with no constraints.

I believe that the linear regression should be unregularized (OLS) and
the R2 to be computed on train data for the above statement to hold.

G

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