Rosternomics
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December 22, 1999

NYYWSN

NYY won this trade +$16.0M surplus NYY won this trade +0.6 WAR
NYYNYY Brian Cashman net +$16.0M net +0.6
received +$12.0M+$12.0M ± $37M expected surplus · +$4.8M realized received 5.0 ± 5 expected · 1.6 realized WAR
Playoff odds: this deal moved NYY's 2000 odds 35% → 32% (-3.7 pts) — how trade timing is graded ↗
receives — most valuable first
Jake WestbrookP·22y·R/R
+$10.5M+$10.5M± $22M exp surplusrealized −$1.6M 3.0± 3 exp WARrealized -0.1
Prior
#21 overall draft pick → 0.54/yr
Evidence
no MLB track record — leans on pedigree
Talent
0.54/yr blended
Horizon
5.5 control yrs
Christian ParkerP·24y·R/R
+$1.8M+$1.8M± $22M exp surplusrealized −$1.6M 1.2± 3 exp WARrealized -0.2
Prior
#100 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
Ted LillyP·24y·L/L
−$0.3M−$0.3M± $20M exp surplusrealized +$8.0M 0.8± 2 exp WARrealized 1.9
Prior
Composite #66.0 pedigree (Baseball America #66 (1999)) — fell off 1 list since, regressed → 0.26/yr
Evidence
recent form -0.3/yr over 0.3 season
Talent
0.14/yr blended
Horizon
5.5 control yrs
WSNWSN Jim Beattie net −$16.0M net -0.6
received +$22.4M+$22.4M ± $31M expected surplus · −$11.2M realized received 3.2 ± 4 expected · 1.0 realized WAR
Playoff odds: this deal moved WSN's 2000 odds 1% → 1% (+0.2 pts) — how trade timing is graded ↗
receives — most valuable first
Hideki IrabuP·31y·R/R
+$22.1M+$22.1M± $31M exp surplusrealized −$11.2M 3.2± 4 exp WARrealized 1.0
Prior
no pedigree — league baseline → 0.21/yr
Evidence
recent form 1.6/yr over 1.8 season
Talent
1.06/yr blended
Horizon
3.9 control yrs × 0.77 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.