More data which I submit puts the HBP/DH increase claim to bed.
In the 4 years leading up to the DH the AL averaged 49 more HBP than the NL (normalized to 2430 games). While not statistically significant in itself, those who claim an increase in HBP in the AL due to the DH must account for some or part of that pre-existing difference in their claim.
One could speculate that the outside chest protectors worn by AL umpires at that time forced pitchers to throw "high" strikes and higher pitches generally. High pitches are more likely to hit batters in my opinion.
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RichW
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“Conservatism consists of exactly one proposition …There must be in-groups whom the law protects but does not bind, alongside out-groups whom the law binds but does not protect.” Frank Wilhoit
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