Rosternomics
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January 27, 2016

DETANA

DET won this trade +$4.0M surplus DET won this trade +0.5 WAR
DETDET Al Avila net +$4.0M net +0.5
received +$2.4M+$2.4M ± $20M expected surplus · +$0.0M realized received 1.3 ± 2 expected · 0.0 realized WAR
Playoff odds: this deal moved DET's 2016 odds 38% → 33% (-4.4 pts) — how trade timing is graded ↗
receives — most valuable first
Kody Eaves2B·22y·L/R
+$2.3M+$2.3M± $20M exp surplusrealized +$0.0M 1.3± 2 exp WARrealized 0.0
Prior
#507 overall draft pick — at the league baseline → 0.21/yr
Evidence
no MLB track record — leans on pedigree
Talent
0.21/yr blended
Horizon
6.0 control yrs
ANAANA Billy Eppler net −$4.0M net -0.5
received −$2.4M−$2.4M ± $28M expected surplus · −$4.0M realized received 0.2 ± 4 expected · -0.5 realized WAR
Playoff odds: this deal moved ANA's 2016 odds 2% → 2% (+0.4 pts) — how trade timing is graded ↗
receives — most valuable first
Jefry Marte1B·25y·R/R
−$2.6M−$2.6M± $28M exp surplusrealized −$4.0M 0.2± 4 exp WARrealized -0.5
Prior
no pedigree — league baseline → 0.21/yr
Evidence
recent form -0.9/yr over 0.2 season
Talent
0.04/yr blended
Horizon
5.0 control yrs

Each player is valued on what he was expected to produce at the time of the trade, versus what he actually produced for his new team.

Expected WAR blends a player's pedigree (composite top-100 rank / draft slot, or a baseline) with his recent track record, projected over the years of team control acquired. The ± figure is a historically calibrated predictive standard deviation, measuring how widely comparable forecasts have missed around their expected value. Surplus values that production at the FA market price of a win (~$8M/WAR) minus salary — so cost-controlled players carry large surplus and expensive ones little, even at the same WAR. Who won is descriptive, not a skill claim: ~99% of a trade's outcome is unforeseeable at the time.