Persistence and Predictability

There seems to be some confusion, or lack of clarity, about my post on corsi vs shooting percentage vs shooting rate the other day so let me clear it up in as straight forward a way as I can. “Hawerchuk” over at writes the following: “I’m not totally sure what he’s getting at. People use Fenwick because it’s persistent, and PDO because it’s not. Over the course of a single season, observed shooting and save percentage drive results, but they are not persistent.” Dirk Hoag over at writes: “Here’s an example of when NOT to use correlation as

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