u/Naile_Trollard

Rankings are given 4 different colors: dark green, light green, yellow, and red. I'm curious where your rankings are bunched, as these seem to correspond to quartiles.

My ranges
Great: 81-100
Good: 71-80
Not Good: 61-70
Bad: 0-60

I find this interesting because it means I rank most films between 61-80. It would make a nice little box and whiskers plot, to be honest, skewed to the high end, which makes sense. I enjoy films, even if they're flawed, and a film really has to be terrible or have little merit in my eyes for me to rank it below 50, even.
I say this because, in general, my rankings follow the standard
90+ is a genuine masterpiece (Fight Club)
80-89 would be great movies I would recommend (Snatch)
70-79 are good movies that I don't regret watching (Fury)
60-69 are films that I enjoy but are heavily flawed (Meet Joe Black or Mr and Mrs Smith)
50-59 are the films that aren't good but still manage to be worth watching once (Reign of Fire? I don't have a Brad Pitt film in this range)
And anything below 50 would be films that I don't find entertaining at all, or not worth the watch (Cool World. I had one Brad Pitt film down here)

I know we share our ranking systems a lot here, but I am more curious about your quartile breakdowns.

So obviously a shuffled deck of cards gives you a statistically impossible arrangement of those cards. As the saying goes, if you're holding a shuffled deck of cards, you're holding a unique arrangement of those cards never before held by human hands. And no time in the future will any other deck of cards be in that same arrangement. I understand how factorial works.

Also, obviously, when you first open a deck of cards that arrangement of cards has been held likely billions of times in the past. It's ordered.

My question is about how many riffles from a fresh deck before you get to an arrangement statistically likely to be unique. Because it seems like one riffle isn't enough. You cut roughly in the middle, giving yourself two sub-decks, both still ordered, and your one riffle isn't going to be swapping the cards around so now the king of hearts is below the queen of hearts (unless that's where you made your cut). Those combinations don't seem like they could give you unique decks yet.

But would two riffles do it? Or would it take three? I know it takes 7 riffles to effectively randomize the cards, but that is about removing order, not creating uniqueness.