Hi Len,
Have a read here: https://edu.thechartist.com.au/kunena/amibroker-coding-and-afl/323-rotational-systems.html#5025
To quote Craig’s comments:
“AB have recommended using P&A for rotational systems due to the way the ranking is processed in regard to the first symbol in the watchlist being tested. It will give erroneous results if that symbol does not have full data history for the test period. This was a recent development after noticing a small number of trades being held past rotation dates when testing certain watchlists.
You can use any symbol for P&A so long as it has full data history, but I’d suggest it needs to make sense for your system and universe being tested.
Do not use P&A for other systems. It can skew some indicators. “
So it seems like a function specific for Rotational Systems.
I haven’t used the function myself… So perhaps others can expand on the thread above if necessary.
Cheers
Glen
