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Negative R2 - 3 links

Very Helpful
http://www.fairlynerdy.com/what-is-r-squared/

Pretty Helpful
https://stats.stackexchange.com/questions/12900/when-is-r-squared-negative

A little Confusing
https://www.researchgate.net/post/Can_we_have_a_negative_R_squared_in_fitting_a_simple_linear_regression_for_exemple_and_how_we_can_explain_this_negative_value