When I said that my plan is based on math I don’t mean the results of back testing and a projected win to loss ratio in the future. That is a generalization at best.
I mean that before I even drew up my plan I did things like… for example: look at the math behind being all in, taking Lots off, adding Lots. There are threads that run for years and argue these things to no end… good grief. The critical differences seem to me to be the rules one uses as they apply these strategies. So develop sets of rules… work out the math that results if those rules are applied… and pick the best one. I’m not thinking at that point about the probabilities of win to loss; I’m thinking about a foundation for a strategy… with the identified rules… that has an advantage. Solid math. That gives me confidence.
A plan is built around math. [For example, applying the same rules to all-in, take-off, and add-on might indicate you need 1 win to cover 4 losses with take-off, 1 win to cover 8.6 losses with all-in, and 1 win to cover 14 losses with add-on.] Small changes in rules can make a big difference. Having rules to complicated to be practical in real time is something worth noticing also.
Having solid math to start with, then it is time for all the back testing and other administrative work. Which is important.
BUT, set all the administrative stuff aside when it comes to actually trading. Hire yourself to do a job. You don’t think about the money. You don’t change the plan while you are trading, let the plan change you. Don’t think about the probabilities. Embrace the unknowable and do the plan/process as objectively as you can. On the weekends or at the end of the month you put your administrative hat back on and make any course corrections necessary.
...at least, that is the way I see it now. It seems like a waste of time almost to do all the stat's of back testing, forward testing, sim trading.
Then when I actually start to trade live those things have zero to do with the unique moment in front of me... The odds that trade will do the expected, or that I expect anything at all.
But all that work somehow goes to confidence and development of skill and perspective. The things again that make trading something other than gambling.