I see 7 times, red Monday following red Friday, in $SPX the last year (including this past Monday):-
Is that manual work or do you have a script to check for that?
For 2022, I have 11 Mondays with a negative net change following a Friday with a negative net change. This is ES, but I would assume SPX would be similar.
But for my prior post, I was specifically looking at a relentless trend day down, i.e., 2 % down or more closing at bottom of the range. That hasn't happen so many times over the last few years.
I count 10 going back to 2015. The following Monday was net positive 70 % of the time.
Also working on other stuff ATM. Maybe before tomorrow's Globex open I'll take another look see.