Rosternomics
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August 31, 2011

SEAATL

SEA won this trade +$12.0M surplus SEA won this trade +0.8 WAR
SEASEA Jack Zduriencik net +$12.0M net +0.8
received +$0.0M+$0.0M ± $6M expected surplus · +$0.0M realized received 0.2 ± 1 expected · 0.0 realized WAR
Playoff odds: this deal moved SEA's 2011 odds 1% → 1% (+0 pts) — how trade timing is graded ↗
receives — most valuable first
Luis Caballero
+$0.3M+$0.3M± $6M exp surplusrealized +$0.0M 0.2± 1 exp WARrealized 0.0
Unidentified minor-league throw-in — valued at the ~0.2 WAR base rate (most produce nothing)
ATLATL Frank Wren net −$12.0M net -0.8
received −$0.8M−$0.8M ± $11M expected surplus · −$12.0M realized received 1.1 ± 1 expected · -0.8 realized WAR
Playoff odds: this deal moved ATL's 2011 odds 11% → 11% (-0.4 pts) — how trade timing is graded ↗
receives — most valuable first
Jack WilsonSS·33y·R/R
−$0.7M−$0.7M± $11M exp surplusrealized −$12.0M 1.1± 1 exp WARrealized -0.8
Prior
league baseline (track record outweighs draft pedigree) → 0.21/yr
Evidence
recent form 1.7/yr over 1.8 season
Talent
1.09/yr blended
Horizon
1.0 control yr

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.