Your Backtest Is Not a Result. It Is the Best of How Many Tries
If you take one thing from this arc, take this, because it is free and it will save you money.
A backtest is not a measurement. It is the winner of a competition you ran, and its apparent quality
depends entirely on how many entrants there were.
Run one idea, test it once, and a good result is weak evidence but honest evidence. Run two hundred
variants and keep the best, and a good result is close to certain regardless of whether anything
real is there. The number on the screen looks identical in both cases. It means almost nothing in
the second.
This is why I care about a few unglamorous things. Sample size, because a strategy with a handful of
trades has not demonstrated anything no matter how the curve looks. Out of sample staying genuinely
out of sample, touched once, not consulted repeatedly until it agrees. And a discount applied to the
survivor in proportion to how wide the search was.
There is a specific version of this trap that catches good engineers. You test, it fails, you adjust
one parameter, you test again. That feels like debugging. It is a search, and every iteration
quietly enlarges the number of tries that your final result has to be discounted for. The counter
does not reset because the attempts were thoughtful.
What I found:
The most dangerous backtest is not the one that fails. Its the one that succeeds on attempt number
forty, because attempt number forty feels like persistence and looks exactly like an edge.
Curious whether this matches what you see on your own charts.
Full story: https://kenkem.biz/en/blog/what-do-you-do-when-your-trading-system-stops-working?utm_source=whop
Master Volume Profile, two ways:
The TradingView indicator, in the Whop shop - 10 day free trial.
The MT5 Expert Advisor, on kenkem.biz - if you would rather it traded your rules for you.
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