MichaelD
Not fooled by randomness
- Joined
- 7 December 2005
- Posts
- 912
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- 2
in the face of a large drawdown or what have you, the operator is not looking for a better way, a better system, until by some pre-determined notion, it is decided not to be working. And that goes against every notion I hold.
If you aren't constantly looking for a better way, what is anyone actually doing?
This is not correct. When a given system reaches failure point it is retired. That is all. It is retired before it does excessive damage to trading capital.
Whilst a system is performing to expectation, research into improving the system is an ongoing process based on completed trades, but the system will not be modified or changed unless it can be proven that the change is likely to improve the system (limits on proof acknowledged but that's a whole area of discussion on its own).
As a specific example, my ASX long term trend following system started off with a rule that trades would be opened and closed at 11am or so as that is what many books suggested to be a good time ("amateurs at 10am, pros at 11am"). Observation of price action on opening/closing trade days lead me to question this trading truism and actually backtest around this - the system now closes positions on the OPEN and opens them on the CLOSE which is providing better results - the system has evolved as it has traded. There have been several changes to the system as a result of this ongoing process.
Developing and trading systems is an ongoing, fluid process. I currently trade 3; one is in full production mode, one is currently in trial mode (small position sizes) and one is 1/2 way through paper trading. They all utilize markedly different timeframes and exploit very different market edges. Also in development at present are 2 other systems for different trading instruments. The vast bulk of systems I work on don't make it past the initial backtesting stage, but the point is that systems development is an ongoing work in progress, not a process that stops when a system commences trading and resumes when the system fails.