Discrepancy between Backtest and RealTrading

• 02/12/2020 at 11:47 AM #119399
  TempusFugit

  Hi,

  I am trying to create some MoneyManagement alternatives for my systems and working on that I think I discovered a discrepancy between backtest results and RealTrading operations, at least for automated trading with IG. That is:

  • In BACKTEST when the size of any order given by the automated system is less than the minimum required for that active in IG (p.e. In FX is 1, in DAX is 0,5….) the order is NOT EXECUTED
  • On the contrary in REAL TRADING when the above happen the order is EXECUTED with the minimum size required.

  That discrepancy can make quite a lot of difference in the results of the ideas I´ve been trying.

  With this post I want to:

  1. Check with you if I am right with this because it wouldn´t be the first time I am wrong with this kind of things
  2. Warn everybody about this, because at least for me with this MM ideas is quite a important thing to consider
  3. Ask if is possible to fix this discrepancy

  Thanks

  

  TempusFugit

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  02/12/2020 at 11:58 AM #119402
  Vonasi

  You should always have in any code that varies position size something that stops any orders below minimum size from being placed. This can be by either turning the size to zero if it is below minimum size or by changing the size to match minimum size if it is below it.

  minsize 0.2 minsizetype = 1 //1 = match to minsize 2 = no trade if under minsize //your money management code here //match to minimum size if minsizetype = 1 then positionsize = max(positionsize, minsize) endif //no trade if under minimum size if minsizetype = 2 then if positionsize < minsize then positionsize = 0 endif endif

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  minsize  0.2 minsizetype = 1 //1 = match to minsize  2 = no trade if under minsize   //your money management code here   //match to minimum size if minsizetype = 1 then positionsize = max(positionsize, minsize) endif   //no trade if under minimum size if minsizetype = 2 then if positionsize < minsize then positionsize = 0 endif endif

   

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  TempusFugit

  

  Vonasi

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