“There is predictable data as far as the eye can see. Millions of variables quietly tracing the path we thought, and perhaps hoped, they would. Because there are so many, noticing when one of these variables does something unexpected is a task that is unsolvable by diligence alone. In order to spot these rare unexpected observations, we need an often-overlooked statistical analysis: anomaly detection.” John Geer ( May 6, 2015 )