OMG I can't believe this fallacy still exists in trading!

Discussion in 'Trading' started by wxytrader, Oct 14, 2023.

  1. taowave

    taowave

    I did a similar backtest on the Russel 3000 going back 15 years. The backtest suffered from survivorship bias which helps the OP's fallacy...

    Rules were to go long when a stock was off 50% from its 252 day high, sell STOP =50% with a 100% profit target..

    50% Stops were hit 57% of the time and the 100% profit target was reached 43% of the time.And that doesnt account for survivorship bias which probably would have skewed the results closer to 62% and 38%..

    So while there is an apx chance of 38% that a stock doubles after getting cut in half,there is a 63% greater likelyhood that a stock off 50% declines another 50%...

    In the spirit of full disclosure,the system was profitable,apx 5.9% per year,but did suffer a 60% max drawdown...

    At the end of the day its a traders FALLACY to believe 50% stocks EASILY go up 100 percent.
    Going down another 50% is the safer bet





     
    Last edited: Oct 17, 2023
    #221     Oct 17, 2023
    comagnum, ph1l and SunTrader like this.
  2. Cabin111

    Cabin111

    Just skimming the thread...Some basics.

    You get concept of the stock dropping 50% and will need to rise 100%...You learned that in second grade, right??

    Let's throw out the $2. and $1. stock...It is NOT making money. It's a "potential" future money maker and can not be counted...That is where your external variable comes into play.

    The blind spot you may not see is this. When a stock has a bad quarter, it is one of two thing. It either is a "one off" (fundamentals are still there), and it will drop. But it will drop with support, because most "smart" people know it is still strong.

    When the $200. stock drops by 50% (bad quarter...And future earnings estimate), people rush to get out of it. Those people are pension funds and mutual funds...They flee!! That does not include the individual investor...Which may have options and margins!!

    The pension fund/mutual funds have to give an account to their board, investors, and pensioners. The companies like Blackrock and Berkshire are allowed to do their own thing (in many ways).

    This is not a knock...Not intended to be. You really should go (in persons) to a investing 101 class at you local community/junior college. It would help. If you are out of country...Take some business classes.

    I would do this before you do any trades.
     
    #222     Oct 17, 2023
    taowave likes this.
  3. Not in an uptrend.
     
    #223     Oct 17, 2023
  4. fundamentals are irrelevant...all stocks follow the same 5 cycle patterns regardless. Is the professor driving a Lambo to school? While he was having his morning coffee at starbucks I was across the street loading up a prepaid credit card to buy Bitcoin back in 2018. :)
     
    Last edited: Oct 17, 2023
    #224     Oct 17, 2023
  5. SunTrader

    SunTrader

    LOL glad I didn't waste another day with this "smart" phone low battery (not just his cell) trader who is going to take down the CBOE and all the other OPS exchanges that are doing it all wrong. Damn right. Just as soon as he can drive his Lambo to a better cell reception location with a freebie 120 receptacle.
     
    #225     Oct 17, 2023
    taowave likes this.
  6. Yeah like when I'm picking up your gf. :)
     
    #226     Oct 17, 2023
  7. ph1l

    ph1l

    Can you explain what you mean by "Not in an uptrend?" During my measurement period all 26 ETFs had overall uptrends like in this one.
    upload_2023-10-17_17-3-28.png
     
    #227     Oct 17, 2023
  8. SunTrader

    SunTrader

    Gf? Would have thought you would have a binary/non-binary whatever "friend" to go with the type of trading you uhh prefer. No? Or are you a real current day hipster that goes both ways. :D
     
    #228     Oct 17, 2023
  9. Yeah look how easily every downturn resumed to previous price and beyond. BUT I thought your math said price would have a difficult time doing this since whatever percent it pulled back, it would need a greater percent to recover?
     
    #229     Oct 17, 2023
  10. SunTrader

    SunTrader

    Geez a strong uptrend doesn't have large retracements to overcome. 50 friggen percent drops do. Haha

    Someone got a 7 yr old to explain this to wxy. Ask the 7 yr old to use crayons even if they think that is silly to do.
     
    #230     Oct 17, 2023