Exp. payoff = (1 + (Average profit / Average loss)) * (Number of profitable trades / Total trades) - 1
Most importantly, this marker must be positive. If it is negative, it means that we will lose the entire deposit soon, if we continue to trade in the same strain. The higher it is the better. Let's substitute values in this formula.
Average profitable trade = $80
Average unprofitable trade = $30
The number of profitable trades = 40
Total trades = 100
Exp. payoff = (1 + ($80 / $30)) * (40 / 100) - 1 = 0,46
For a more visual example and in order to understand how the expected payoff changes over time we can construct a graph with the same name. It can be constructed using different periodicity: By trades, by days, by weeks and by months. We will construct it by days and see how the expected payoff has been changing day by day