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Drawdown may refer to: Drawdown (economics), decline in the value of an investment, below its all-time high. Drawdown (hydrology), a lowering of a reservoir or a change in hydraulic head in an aquifer, typically due to pumping a well.
The drawdown (at least according to Wikipedia), saves a peak's value, and for every value later which is lower than the value of the peak, calculated: $DD = {(peak - value) \over peak}$. The problem arises when the first peak of the trading strategy is of value 0. That forces me to divide by 0. For backtesting purposes, I always assume the net value of the robot is 0, and from that point on it makes profits or losses. Other assumptions may solve the problem, but arbitrarily; different decisions for initial value will lead to different drawdown calculation results.