Rosternomics
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December 18, 2013

BALKCR

BAL won this trade +$2.4M surplus BAL won this trade +0.4 WAR
BALBAL Dan Duquette net +$2.4M net +0.4
received +$26.4M+$26.4M ± $46M expected surplus · +$4.8M realized received 4.8 ± 6 expected · 0.9 realized WAR
Playoff odds: this deal moved BAL's 2014 odds 39% → 43% (+4 pts) — how trade timing is graded ↗
receives — most valuable first
David LoughOF·28y·L/L
+$26.5M+$26.5M± $46M exp surplusrealized +$4.8M 4.8± 6 exp WARrealized 0.9
Prior
league baseline (track record outweighs draft pedigree) → 0.21/yr
Evidence
recent form 2.2/yr over 0.7 season
Talent
0.97/yr blended
Horizon
5.5 control yrs × 0.90 age decline
KCRKCR Dayton Moore net −$2.4M net -0.4
received +$2.4M+$2.4M ± $18M expected surplus · +$2.4M realized received 1.0 ± 2 expected · 0.5 realized WAR
Playoff odds: this deal moved KCR's 2014 odds 24% → 21% (-2.9 pts) — how trade timing is graded ↗
receives — most valuable first
Danny Valencia3B·29y·R/R
+$2.6M+$2.6M± $18M exp surplusrealized +$2.4M 1.0± 2 exp WARrealized 0.5
Prior
league baseline (track record outweighs draft pedigree) → 0.21/yr
Evidence
recent form 0.5/yr over 1.1 season
Talent
0.34/yr blended
Horizon
4.0 control yrs × 0.76 age decline

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.