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Hello @StefanieSenger, This will be my first contribution to scikit-learn. I'd like to work on `examples/linear_model/plot_ols.py` if it's available. Thank you!

Hello @StefanieSenger, I just realized that `plot_ols.py` is already referenced in the User Guide, so there isn’t much to add there. My apologies for the oversight. I would still love...

Thanks for the PR! Overall, the implementation looks solid, but the explained variance calculation can be optimized. As noted in Abdi (2003) [1] p.3, the explained sum of squares can...