Rosternomics
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December 11, 2017

TBROAK

TBR won this trade +$56.0M surplus TBR won this trade +9.0 WAR
TBRTBR Erik Neander net +$56.0M net +9.0
received +$2.4M+$2.4M ± $15M expected surplus · +$53.6M realized received 1.5 ± 2 expected · 8.7 realized WAR
Playoff odds: this deal moved TBR's 2018 odds 38% → 60% (+22.5 pts) — how trade timing is graded ↗
receives — most valuable first
Joey Wendle2B/3B/SS·28y·L/R
+$2.2M+$2.2M± $15M exp surplusrealized +$53.6M 1.5± 2 exp WARrealized 8.7
Prior
#203 overall draft pick — at the league baseline → 0.21/yr
Evidence
recent form 1.5/yr over 0.2 season
Talent
0.37/yr blended
Horizon
5.5 control yrs × 0.75 age decline
OAKOAK Billy Beane net −$56.0M net -9.0
received +$1.6M+$1.6M ± $21M expected surplus · −$2.4M realized received 1.2 ± 3 expected · -0.3 realized WAR
Playoff odds: this deal moved OAK's 2018 odds 78% → 59% (-19.2 pts) — how trade timing is graded ↗
receives — most valuable first
Jonah HeimC·23y·B/R
+$1.8M+$1.8M± $21M exp surplusrealized −$2.4M 1.2± 3 exp WARrealized -0.3
Prior
#129 overall draft pick — at the league baseline → 0.21/yr
Evidence
no MLB track record — leans on pedigree
Talent
0.21/yr blended
Horizon
5.5 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.