R help - Apr 2015 - Cross-Validate a Multivariate Polynomial Regression with K-folds

Hi,

could you tell me please which is the fastest and most accurate
way/algorithm/code of cross-validating a Multivariate Polynomial Regression
with K-folds? I have a dataframe of 5 input variables and I want to predict
one output variable. Every variable features a different power for which
the error is the smallest.

I was replicating the steps from this video:
https://www.youtube.com/watch?v=6dSXlqHAoMk

Ideally, I would want to use also GAM and ANN to see which method behaves
faster and more accurately. Could you also suggest me other non-linear
models?

Thank you in advance,
Nick

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