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  • Madusudanan Rengasamy thinks this is interesting:

If you train a linear model on this data, you get the solid line, while the old model is represented by the dotted line. As you can see, not only does adding a few missing countries significantly alter the model, but it makes it clear that such a simple linear model is probably never going to work well. It seems that very rich countries are not happier than moderately rich countries (in fact they seem unhappier), and conversely some poor countries seem happier than many rich countries.

From

Cover of Hands-On Machine Learning with Scikit-Learn and TensorFlow

Note

Dimensionality reduction and feature extraction