Supplemental materials for our era-adjusted baseball statistics website
Era adjustment is made via Full House Modeling. This model computes era-adjusted statistics through a principled balancing of how well a player performed "vs their peers" and the size of the MLB talent pool.
Version 2.1 (consistent with website)
We present an updated version of the website with:
- An updated writeup that highlights some results and discussions based on our era-adjusted statistics.
- Data through 2024 season
- Better UI on mobile devices
- Added loess smoothing of home run counts for Dead Ball era players
Version 2.0 (consistent with paper)
We present a new version of the Full House Model with:
- A new and better justified estimation of the talent pool over time
- Version 2.0 of a detailed writeup that highlights some results and discussions based on our era-adjusted statistics.
- A technical report that goes through important calculations and additional analyses
- Data through the 2023 season
- Removed rotation adjustments
- Removed smoothing
The app contains several era-adjusted statistics for baseball players which are obtained from the Full House Model. This model computes era-adjusted statistics through a principled balancing of how well a player performed "vs their peers" and the size of the MLB eligible population. Under this model, great all-time statistics requires that an MLB player is both better than their peers and played during a time in which the MLB eligible population is large. In this way, the model constructs an even playing field that extends across eras.
For a fun read on the Full House Model see our three-part series: article I, article II, article III
Our original estimation of the talent pool can be seen here.