Rosternomics
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May 25, 2018

TBROAK

TBR won this trade +$4.0M surplus TBR won this trade +0.6 WAR
TBRTBR Erik Neander net +$4.0M net +0.6
received −$3.2M−$3.2M ± $15M expected surplus · +$4.0M realized received 0.2 ± 2 expected · 0.6 realized WAR
Playoff odds: this deal moved TBR's 2018 odds 58% → 60% (+2.3 pts) — how trade timing is graded ↗
receives — most valuable first
Wilmer FontP·28y·R/R
−$3.4M−$3.4M± $15M exp surplusrealized +$4.0M 0.2± 2 exp WARrealized 0.6
Prior
no pedigree — league baseline → 0.21/yr
Evidence
recent form -1.5/yr over 0.1 season
Talent
0.05/yr blended
Horizon
5.5 control yrs × 0.55 age decline
OAKOAK Billy Beane net −$4.0M net -0.6
received +$2.4M+$2.4M ± $22M expected surplus · +$0.0M realized received 1.3 ± 3 expected · 0.0 realized WAR
Playoff odds: this deal moved OAK's 2018 odds 61% → 59% (-2.3 pts) — how trade timing is graded ↗
receives — most valuable first
Pete BayerP·23y·R/R
+$2.3M+$2.3M± $22M exp surplusrealized +$0.0M 1.3± 3 exp WARrealized 0.0
Prior
#270 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

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.