xFantasy, Part II: Triple Slash Converter

Following up on the introduction of xFantasy this week, I’ve packaged the projection equations together here into a single Triple Slash Converter tool. This allows you to input a player’s PA, AVG, OBP, and SLG, and will spit out the resulting expected 5×5 stats. Check out the original post to explore the equations used in more detail.

Triple Slash Converter

A few optional things can be used to improve the projected fantasy line…

  • Batting order: Must be an integer between 1 to 9. Determines overall R/RBI/SB as well as distribution of R vs. RBI. If you aren’t sure, the sixth spot is about average production.
  • Team runs: Number of runs you expect the player’s team to score (full season). More team runs means more player R/RBI. If you aren’t sure, 720 is about average.
  • Team SB: Number of bases you expect the player’s team to steal (full season). More team SBs means more player SBs. If you aren’t sure, 85 is about average.
  • SPD: The SPD score for a player is fairly consistent year-to-year (outside of aging effects), and is useful for two reasons: 1) Faster players score more runs 2) SPD predicts SB’s well. If you aren’t sure, 3 or 4 is about average for fantasy-relevant players.

Part III, examining the predictive power of xFantasy and comparing it to projections, is still in the works, but I realized that the package of equations from Part I would be much more useful if everyone had a tool to play around with them!



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Stanford Professor, baseball enthusiast, owner of too many Steam games. Follow @RyanEBrock on Twitter for occasional nuggets of baseball wisdom. Purveyor of the HarperWallbanger blog and Big Board at https://GetBigBoard.com/

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scotman144
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This is really cool work: thanks for sharing!