Define position size as percentage of account

• 05/17/2020 at 3:54 PM #131990
  badar80

  Hi all,

  I was wondering how to define my contract size to be 0.5 % of my account size, for example my stop loss I’d like to keep defined at 100 pips and then the contract size would be defined as a function of account size and pip value.
  I found the “% max risk exposure” in the ProBacktest manual, but am not sure if this is along the right lines, could anyone please help?

  Thanks!

  

  badar80

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  05/18/2020 at 10:34 AM #132105
  Nicolas

  This small snippet will calculate the lot size according to your account and risk in percentage.

  //MM lot size REM Money Management Capital = 10000 Risk = 0.01 // = 1% StopLoss = 100 // value of stoploss in pips/points REM Calculate contracts equity = Capital + StrategyProfit maxrisk = round(equity*Risk) PositionSize = abs(round((maxrisk/StopLoss)/PointValue)*pipsize)

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  //MM lot size REM Money Management Capital = 10000 Risk = 0.01 // = 1% StopLoss = 100 // value of stoploss in pips/points REM Calculate contracts equity = Capital + StrategyProfit maxrisk = round(equity*Risk) PositionSize = abs(round((maxrisk/StopLoss)/PointValue)*pipsize)

   

  

  Nicolas

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  05/18/2020 at 3:34 PM #132163
  badar80

  Many thanks Nicholas! I’ll give this a try.

  

  badar80

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  05/18/2020 at 4:27 PM #132172
  badar80

  I have also noticed that my live trade was closed on Friay night. This was not supposed to happen; it was nowhere near either the stop loss or take profit, could anyone please advise as to how I could stop this from happening?

  I saw code with ‘lasttime’ and ‘opening time’ stipulated (https://www.prorealcode.com/topic/hold-over-the-weekend-or-not-test/); could these in some ways be used to let open trades carry on over the weekends?

  Thanks again.

  

  badar80

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  05/18/2020 at 4:33 PM #132174
  Vonasi

  Trades will only close if you have instructions in your code to do so. Possibly your broker expanded the spread over the weekend that meant that one of your stop prices was met and the trade closed. If you believe that one of your trades was closed when it should not have been then you should contact your broker and ask them why it closed.

  

  Vonasi

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  05/18/2020 at 4:38 PM #132176
  badar80

  Thanks for the response Vonasi, it was a short trade and there was a gap down over the weekend, but this would still not have resulted in the TP being hit, I’ll ask the broker.

  Thanks again,

  Badar.

   

   

  

  badar80

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