Equity Curve
As well as the summary and trade by trade results you can examine the "Equity Curve". This is extremely valuable as part of the assessment of back test results and gives you a very visual indication of what it has been like to trade the symbol throughout the back test period.
It shows winning (up) periods and losing (down) periods. You will immediately see if there are periods of several losing trades in a row but more importantly you do not want to see a huge profit made from just one or two trades with all the others being average or poor.
The Equity Curve visually reveals the detail under the figures. The perfect Equity Curve would be a straight line from bottom left to top right. This is not possible but the closer we see to that ideal the better it has traded in the past and therefore the better it is likely to trade in the future.
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