Is probability frequentist or Bayesian?

Spoiler alert: it's neither

The single biggest argument about statistics: is probability frequentist or Bayesian? It's neither, and I'll explain why.

Buckle up. Deep-dive explanation incoming.

First, let's look at what is probability.

Probability quantitatively measures the likelihood of events, like rolling six with a dice. It's a number between zero and one. This is independent of interpretation; it’s a rule set in stone.