League Parity, and Repeatability of Points Per Game

I was inspired the other day by something Steve Fenn (@StatHunting on Twitter) wrote about analytics in soccer:

This question of repeatability is something that resonated with me, so I started digging around a bit. While I can’t claim great familiarity with some of the advanced modeling that goes on around the soccer world, my starting point was a fairly simple question:

How repeatable is team success itself?

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