True, `SPX` over `200 MA` may or not define a bull market( depending of course if one is fan of Tudor JonesI'm not sure about the 20-day breakout in modern bull markets. You'd need to quantify the rules (bull market = SPX > 200 day MA? or above its price level 12 months ago?) and specify the entry and exit signals. A lot of strategies seem profitable and no-brainer until you do the work of testing them. Most end up being quite disappointing. I've noticed people will revive Turtle after something like 2008, the COVID crash or the first few months of this year. Yes, it works pretty well with high volatility and big moves in stocks, oil, gold, etc. However, there are also plenty of "head fakes" where markets appear to be crashing or starting big rallies that fizzle. You'll have to trade during those or find a good filter...and things like ADX don't really work--they just tell you what happened in the past.
) but is not per se an environment where 20 day `BO` works always because there are periods of choppy oscillations really long above `200MA`, i have to correct myself, is really when there is euphoria, and everybody can agree and decide which parameter using to determine this, because there are a plethora of ways to go, to understand if is *that* period can last a year or a 2 weeks short lived rally that ALWAYS come in a year, that everybody loves.Back testing is overrated for technical analysis imo, and not because of fitting curves or delisted/not delisted stocks, but because as our troll/OP suggested the past does not predict the future, and is left to our intelligence and research on how to be smart on this point. We do not need to be outsmarted by pool of geniuses employed by a market maker or investment bank, fund, I want to play in their direction, and usually is not a day trade game. My first tought is: when the market goes crazy up or whipsaws down who and why is taking the other direction, who is exploiting miss volatility. How and when to backtest is left to my intelligence and my python skills
In 2020 even if one had planted a plant on ashes would have grown to the sky. ADX? Indeed is a super lagging indicator to me, but is the context where is used that matters I guess. I am not a trader for a living, I am newbe, and can identify quite a few psychological mistakes I did this year, so do not care anymore about bull traps, head fakes, (possible) manipulations, because I do not want to overtrade, I want to learn from my mistakes..because I am mostly a technical trader. Few of use would dare to disagree maybe that losses can come after a streak of confident hits

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