negative r squared

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AP
AP am 7 Jul. 2011
I have fitted the line y=x which passes through origin to a bunch of data by using cftool. I got a negative r squared for the coefficient of determination. Could someone shed light on what that means? I know that y=x is not the best fit but I want to see how much is the determination coefficient if I force the data to be fitted to y=x.
Thanks.

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Oleg Komarov
Oleg Komarov am 7 Jul. 2011
<http://www.minitab.com/en-IT/support/answers/answer.aspx?ID=1037&langType=2057>
Regressing through the origin doesn't give the R^2 you expect.

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