"Expectancy is the measure of the average profitability expected from a trading strategy over the long term."
In-Depth Definition
In finance, expectancy represents the expected value (or mathematical expectation) of the gains or losses of a trading system. It is calculated by taking into account the percentage of winning trades (success rate), the average gain per winning trade, and the average loss per losing trade. A positive expectancy indicates that the strategy is profitable in the long run, while a negative expectancy means that it is doomed to loss. It is crucial to understand that expectancy does not guarantee a result on each individual trade, but it gives an indication of the viability of the strategy over a large number of transactions.
To calculate expectancy, the following formula is often used: Expectancy = (Probability of Gain * Average Gain) - (Probability of Loss * Average Loss). The importance of expectancy lies in its ability to help traders evaluate and compare different strategies, as well as adjust risk parameters to maximize their profit potential. A rigorous analysis of expectancy is fundamental to the development of a solid and sustainable trading plan.
StarQuant Insight
StarQuant's AI can help calculate expectancy in real time by analyzing historical trading data and simulating future scenarios. It can also identify opportunities to improve expectancy by suggesting adjustments to trading rules, entry and exit points, and stop-loss and take-profit levels. In addition, AI can monitor the evolution of expectancy over time and alert the trader in the event of a significant deviation from expected performance.
Pro Tip
Do not focus solely on the success rate. A strategy with a low success rate but a high gain/loss ratio may have a positive expectancy and be more profitable in the long run than a strategy with a high success rate but a low gain/loss ratio.