ROTISSERIE: Changing power balance, pt. 2

This is Part 2 of our investigation of the changing power balance between hitting and starting pitching in recent seasons. In Part 1, we documented several shifts in the player pool configuration in recent seasons:

• The number of hitters producing large HR numbers has declined, while the number of pitchers posting competitive ERAs has increased.
• The number of highly-skilled, low-risk (Tier 1) hitters has dropped significantly while the number of Tier 1 starting pitchers has been growing.
• Starting pitchers are more likely than hitters to retain core status as highly skilled, low risk Tier 1 players from one season to the next.
• The number and proportion of Tier 1 hitters possessing plus power (120+ PX) has declined, and is...

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