Rosternomics
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June 15, 2010

OAKARI

ARI won this trade +$3.2M surplus OAK won this trade +0.9 WAR
OAKOAK Billy Beane net −$3.2M net +0.9
received +$6.4M+$6.4M ± $18M expected surplus · −$8.8M realized received 1.3 ± 2 expected · 0.3 realized WAR
Playoff odds: this deal moved OAK's 2010 odds 13% → 14% (+1.2 pts) — how trade timing is graded ↗
receives — most valuable first
Conor Jackson1B/OF·28y·R/R
+$6.1M+$6.1M± $18M exp surplusrealized −$8.8M 1.3± 2 exp WARrealized 0.3
Prior
league baseline (track record outweighs draft pedigree) → 0.27/yr
Evidence
recent form 0.9/yr over 1.5 season
Talent
0.64/yr blended
Horizon
2.0 control yrs
ARIARI Jerry Dipoto net +$3.2M net -0.9
received +$1.6M+$1.6M ± $22M expected surplus · −$5.6M realized received 1.2 ± 3 expected · -0.6 realized WAR
Playoff odds: this deal moved ARI's 2010 odds 3% → 2% (-0.3 pts) — how trade timing is graded ↗
receives — most valuable first
Sam DemelP·24y·R/R
+$1.8M+$1.8M± $22M exp surplusrealized −$5.6M 1.2± 3 exp WARrealized -0.6
Prior
#120 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.