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Was your backtest luck?
A Sharpe ratio means nothing on its own. What matters is how many things you tried before you found it — because the best of many tries is large even when every underlying edge is zero. Put your numbers in.
This used the Sharpe you typed. On your real return series it can also correct for fat tails, run the overfitting probability, and — the part you cannot do yourself — count the trials for you, so the number above cannot be understated.
The arithmetic is Bailey and López de
Prado's deflated Sharpe, computed in this page — nothing you type is sent anywhere.
It is verified against
quant-integrity,
which is open source, so you never have to take our version of it on trust.