Antoine Rebecq shares a warning:
I was recently working on a cool dataset that looked unusually friendly. It was tidy, neat, interesting… the kind of things that you rarely encounter in the wild! My goal was to build a super simple predictor for one of the features. However, I kept getting poor results and at first couldn’t figure out what was happening.
There’s some good, practical advice in there, so check it out. H/T R-Bloggers