Rosternomics
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June 3, 2015

BOSBAL

BAL won this trade +$0.8M surplus BOS won this trade +1.0 WAR
BOSBOS Dave Dombrowski net −$0.8M net +1.0
received +$18.4M+$18.4M ± $32M expected surplus · −$0.8M realized received 3.5 ± 4 expected · 1.0 realized WAR
Playoff odds: this deal moved BOS's 2015 odds 5% → 6% (+1.2 pts) — how trade timing is graded ↗
receives — most valuable first
Alejandro De AzaOF·31y·L/L
+$18.1M+$18.1M± $32M exp surplusrealized −$0.8M 3.5± 4 exp WARrealized 1.0
Prior
no pedigree — league baseline → 0.21/yr
Evidence
recent form 1.9/yr over 2.1 seasons
Talent
1.31/yr blended
Horizon
3.0 control yrs × 0.89 age decline
BALBAL Dan Duquette net +$0.8M net -1.0
received +$2.4M+$2.4M ± $21M expected surplus · +$0.0M realized received 1.3 ± 3 expected · 0.0 realized WAR
Playoff odds: this deal moved BAL's 2015 odds 17% → 14% (-3 pts) — how trade timing is graded ↗
receives — most valuable first
Joe GunkelP·23y·R/R
+$2.3M+$2.3M± $21M exp surplusrealized +$0.0M 1.3± 3 exp WARrealized 0.0
Prior
#533 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.