Is your "process" tested to be absolutely reliable and profitable? If yes, just trade "the process". It's not that difficult. Unless you don't trust "the process". Then that's a different story. Sounds to me you don't trust "the process" so you feel there is always a need for you to interfere and deviate from "the process" and put in your own discretionary trades.
It is not that traders don't trust the process. It is that living through long draw downs requires a lot of discipline.
For example, one very strong temptation during a multi month draw down is to do research and find better automated trading rules or parameters and switch to those instead.
And you reason with yourself that you are improving your trading and not losing discipline.
Everyone knows improving your system is a good thing right?
What happens next is that soon after switching over the old rules start working very well again and outperform your new rules in terms of getting out of the current drawdown.
It may actually be the case that the new rules will be a bit better in the long run, but switching over at that time keeps you in the current drawdown for many more months.
Jerry Parker, hedge fund manager and turtle trader for last 50 years sums up the above by saying:
"You're tempted after a certain period of underperformance to tinker with your systems and call up research. Then as soon as you implement the new research you find out, well the older system would have performed better"
He actually says doing the above has cost him *alot* of money over the years.
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