[jbob2000]

Thanks for the replies and the detailed sources, it's interesting to read!

> Point being, they aren't clairvoyant oracles.

Yeah, my argument was weak in that regard. They aren't anywhere close to perfect or accurate, I'll admit.

> you seem to be claiming some form of what economists call "omitted variable bias"

Yes! Is that what it's called?

> please point to a concrete example of a team in a critical game receiving a disproportionate number of calls

Corruption doesn't have to be that explicit. Maybe key players or coaches are paid to perform poorly? It doesn't always come down to the ref. But I admit I have no examples.