Rosternomics
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July 14, 2016

BOSSDP

BOS won this trade +$20.0M surplus BOS won this trade +3.1 WAR
BOSBOS Dave Dombrowski net +$20.0M net +3.1
received +$11.2M+$11.2M ± $20M expected surplus · +$20.0M realized received 2.9 ± 2 expected · 3.1 realized WAR
Playoff odds: this deal moved BOS's 2016 odds 86% → 88% (+1.4 pts) — how trade timing is graded ↗
receives — most valuable first
Drew PomeranzP·27y·R/L
+$10.9M+$10.9M± $20M exp surplusrealized +$20.0M 2.9± 2 exp WARrealized 3.1
Prior
league baseline (track record outweighs draft pedigree) → 0.57/yr
Evidence
recent form 1.2/yr over 1.8 season
Talent
0.97/yr blended
Horizon
3.0 control yrs
SDPSDP AJ Preller net −$20.0M net -3.1
received +$24.8M+$24.8M ± $43M expected surplus · +$0.0M realized received 6.2 ± 5 expected · 0.0 realized WAR
Playoff odds: this deal moved SDP's 2016 odds 0% → 0% (-0 pts) — how trade timing is graded ↗
receives — most valuable first
Anderson EspinozaP·18y·R/R
+$24.7M+$24.7M± $43M exp surplusrealized +$0.0M 6.2± 5 exp WARrealized 0.0
Prior
Composite #19.0 prospect (Baseball America #19 (2016)) → 1.12/yr
Evidence
no MLB track record — leans on pedigree
Talent
1.12/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.