The Kalman Filter is an algorithm for taking noisy measurements of dynamic systems and using them to get a better idea of the underlying dynamics than you could get from a simple extrapolation. If you've ever run a marathon, or been a nuclear missile, you probably know all about these challenges already.

IMPORTANT NON-DATA SCIENCE CHICAGO MARATHON RACE RESULT FROM KATIE: My finish time was 3:20:17! It was the closest I may ever come to having the perfect run. That’s a 34-minute personal record and a qualifying time for the Boston Marathon, so… guess I gotta go do that now.

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