Hey Rui! I really liked your questions:

- Regarding the 2nd degree polynomials. You nailed it, 2nd degree polynomials are parameter-less (I guess the choice of the degree is the parameter itself), they're well known and quite robust. The problem with them is they have a strong assumption: the rate of change on the relationship is constant, which doesn't fit out domain knowledge. However recently I had the chance to try other transformations but couldn't beat them. Splines don't really work for our business needs and I tried other basis (sigmoidal and gaussian) and would only work for very specific…

Javier Mas Adell

Data Alien

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