add test for regressions #79
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I think I have the invariants right now, but I am still getting -Infinity for R-squared, which should range from 0 to 1. |
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I didn't looked at code closely not I did try to run it. But R² = ∞ could happen if matrix becomes singular. Having more rows that columns is necessary but not sufficient condition. For example it's not possible to make regression with following points: [(0,1),(0,2),(0,3)]. |
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I'm having a bit of trouble understanding how the least-squares regression is meant to be called, so I added a failing test with my understanding of the constraints.