How can I tell if my system is ROBUST

Discussion in 'Trading' started by Aafwintb, Sep 7, 2001.

    #31     May 21, 2004
  2. IMO, the best source for an answer to this question is Stridsman's book:


    It is a very serious book that is sometimes hard to follow but well worth spending time with.

    Don't get fooled by the title, the book is about the ways to find systems that long term work and not about the trading systems used as examples in the book.

    #32     May 21, 2004
  3. But what's the difference between your use of ratio of win/loss and % of win/loss? Seems like they're measuring the same thing - just different semantics.
    #33     May 21, 2004
  4. PF and Avg Win/Avg Loss? [/QU

    Is this a question or an answer/statement?

    sorry about that. that was suppose to be my answer.

    concerning another post:
    they are not the same. if you have a positive profit factor and a less than good ave win/ave loss ratio it tells us that you could be profitable but you could experience loss because of a negitive event in the market with slippage. it means you are having to trade more to achieve that save profit. if you have a good PF and a good win/loss ration, it means you are not overtrading to achieve the same profit which reduces your risk because of your exposure to the market.
    #34     May 21, 2004
  5. Thansk for the clarification/explanation. Why do you use 2 as a base line for the product of PF and Avg Win/Avg Loss? What is the range of values you've seen for this product, what would you consider to be a high value for a theoretically exceptional system?.
    #35     May 21, 2004
  6. i use 2 + because most good systems don't have a % win loss over 50% and so you need a high 2 to survive.
    #36     May 21, 2004
  7. That wasn't what I was asking.

    Perhaps if you just give a clearer example of the three different values that you're using and their derivation it would clear up the whole question. With the brief text you used, it still looks like two of the three are essentially the same thing.

    #37     May 21, 2004
  8. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    Think with my personality, Ron has an excellant point if its only one system only
    which is clearly implied from the original question.

    For those with & more than one system , in specificaly this or any bull market
    not many trades /investments for majority of profit could be profitable & good with buy & sell plan.

    Uptrends profits run ;
    however just thought of a high % gainer uptrending semi
    probably never will trade because
    profits big trend in way too small & tricky a time frame,even over a year.

    #38     May 21, 2004
  9. Robust trading system should:

    1. Have variables which produce reasonable profit that are not only your chosen variable. For example, you're using the 20 and 50 day moving average. What about the 19 and 49 day MA's? And the 21 and 51 day MA's? The system should also be profitable with them too. If there is a sharp drop-off in profitability with input parameters that are close to the numbers you are using, the system is likely over-optimized.

    2. Have a reasonable drawdown, one you can live with.

    3. Have some sort of stop so that you avoid having that 40% loss that every once in a while comes along and kills you. A 10% loss without much of a change in profitability will really make you feel better and keep you out of a free fall (provided you can get out, of course - remember, if in desparation you can always buy an option to hedge your position, at least temporarily).

    Regards, S
    #39     May 21, 2004
  10. TickJob


    A robust system should also work in any market.
    #40     Oct 25, 2005