Sometime in 2013, before the bitcoin prices exploded, I downloaded some bitcoin historical price data and ran symbolic regression on it with Eureqa. It came up

Sometime in 2013, before the bitcoin prices exploded, I downloaded some bitcoin historical price data and ran symbolic regression on it with Eureqa. It came up with a formula that fit the observed data fairly well, and wasn't very complicated. But when I extrapolated it forward a few months, it predicted the price would explode to unreasonable levels. I was disappointed and threw it away, assuming that it must be wrong.