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The important thing to note here is this: Don’t use per-nine-innings or per-inning stats. Good statistics measure performance in the context of opportunity. Every batter faced presents an opportunity for a strikeout. Using innings as a denominator turns batters that get hits or draw walks into null events, when instead they should count against a pitcher. Always use percentage stats, not stats per some timeframe. (I usually tease intentional walks out of the walks and the batters-faced numbers, but that’s less of an issue in modern baseball as intentional-walk rates drop, in the full-DH era, to nearly nothing.)
