[mritchie712]

Another common error I see is timing (e.g. using data from the "future" to predict an event). To build on your loan example, if you inadvertently included the current FICO score of an applicant that applied 12 months ago, it will be unfairly correlated with the loans current performance.

[kmax12]

This is very important! If you use Featuretools, we provide a mechanism to avoid this very problem. See how we handle time in our documentation here: https://docs.featuretools.com/automated_feature_engineering/...