Rosternomics
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November 19, 2004

SEASDP

SEA won this trade +$1.6M surplus SEA won this trade +0.1 WAR
SEASEA Bill Bavasi net +$1.6M net +0.1
received +$2.4M+$2.4M ± $23M expected surplus · +$0.0M realized received 1.3 ± 3 expected · 0.0 realized WAR
Playoff odds: this deal moved SEA's 2005 odds 1% → 1% (+0 pts) — how trade timing is graded ↗
receives — most valuable first
Billy HoganOF·22y·R/R
+$2.3M+$2.3M± $23M exp surplusrealized +$0.0M 1.3± 3 exp WARrealized 0.0
Prior
#131 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
SDPSDP Kevin Towers net −$1.6M net -0.1
received −$2.4M−$2.4M ± $14M expected surplus · −$1.6M realized received 0.3 ± 2 expected · -0.1 realized WAR
Playoff odds: this deal moved SDP's 2005 odds 30% → 29% (-0.7 pts) — how trade timing is graded ↗
receives — most valuable first
Randy WilliamsP·29y·L/L
−$2.2M−$2.2M± $14M exp surplusrealized −$1.6M 0.3± 2 exp WARrealized -0.1
Prior
#364 overall draft pick — at the league baseline → 0.21/yr
Evidence
recent form -0.1/yr over 0.2 season
Talent
0.16/yr blended
Horizon
5.0 control yrs × 0.43 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.