I must confess that I didn't really understand what anchak said about Hyperbolic functions, etc.

I wasn't able to make heads or tails of what was said in those links talking about A.I.M. Too much handwaving and generalities. It appeared that links posted in _those_ discussions laid out the rules more clearly---but all those links were dead. It also appeared that the discussions pretty much ended sometime around 2016. And, yeah, evidently there were a site or two that you could subscribe to to get the signals done for you. Those are all dead. So it looks to me like people tried it and subsequently abandoned it.

But now I'm curious, and like I said I have the historical raw data for S&P500, and a bunch of spreadsheets that backtest various things. So if somebody could tell me the actual mechanical rules for this strategy I could probably come up with a backtest.

One of the interesting thing that some of my spreadsheets do is to specify different starting dates, so that you can compare a strategy vs. buy-and-hold for different time periods. That also is something that I could probably incorporate without too much trouble.

BTW, one thing that concerns me and raises a huge red flag is all the talk about "modifying" the triggers, have seen mentioned thresholds anywhere from 3% to 10%. That is not a sign of a concrete strategy, that's just flailing.

It also is phony to assume cash returns of constant X%. The 1-year T-bill rate has ranged between 0.05% and 16.72% between 1950 and 2022. You *must* use the current contemporaneous interest rate for the cash balance. And of course you need to go by very short-term rates, not long-term rates, otherwise your cash is subject to interest rate risk. By definition, this cash waiting for investment is short-term.