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Kelly criterion

This money management method implements the Kelly criterion. The formula is:

Kelly % = W – [(1 – W) / R]
where: W = Winning probability R = Win/loss ratio

Since the Kelly method is known to be risky, there are two additional safeguards: option to specify a Kelly fraction (percentage) to use, and to cap the maximum size at a certain percentage.

The calculation is rolling, based on the user-specified number of last trades (30 by default). To determine the position size for the first trades, the PosSizer uses a percentage of equity (Default % equity). The PosSizer operates on closed positions only.

Kelly method

Kelly method

Notes and Limitations

  • If PosSizer suddenly stops trading, increase the Window size to exceed your system's largest winning/losing streak (whichever is greater). (There's a higher chance to notice it with intraday backtests).


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