Let’s describe the most common trading rules schematically. I’ll take the liberty to do so, and please don’t judge me too harshly.
Select a Financial Instrument: Look at several time intervals (timeframes). For simplicity, let’s call them large and small. On the large timeframe, we observe the overall or global trend, and on the small timeframe, we look for a “more precise” entry point.
Choosing a Signal: The next step after selecting the interval is choosing a signal. Generally, I would divide signals into three categories:
Rebound or break out of a level
Indicator readings
Some cyclical or wave theory
Additionally, movements can be impulsive or corrective. There is also a market phase called stagnation, where the market seems lost and unsure of whether to go up or down. The signal from the chosen category works either on the impulse or correction; some categories work well specifically in this unrecognized phase. No indicator would indicate in real-time that phases have changed. Therefore, concepts like “false breakouts” or “stop-hunting” exist.
Planning System: Finally, a trading strategy should include some planning system that defines the profit-to-loss ratio within a specific proportion.
It seems like I didn’t miss anything.
Such systems certainly exist and can be tested on historical data to achieve acceptable results. In theory. In practice, I don’t know of any working systems over a period longer than five years.
The reasons, in my opinion, are several:
Unclear criteria for choosing intervals
How to resolve contradictions if the same signal gives opposite indications on different timeframes
Attempting to secure the system by introducing additional signals leads to significant delays in specific actions and too high possible risks
How to resolve contradictions between different signals on one timeframe