Rosternomics
← Trade Database
May 11, 1990

ANANYY

NYY won this trade +$13.6M surplus ANA won this trade +0.2 WAR
ANAANA Mike Port net −$13.6M net +0.2
received −$4.8M−$4.8M ± $0M expected surplus · −$13.6M realized received 0.0 ± 0 expected · 1.5 realized WAR
Playoff odds: this deal moved ANA's 1990 odds 28% → 24% (-3.3 pts) — how trade timing is graded ↗
receives — most valuable first
Dave WinfieldOF·38y·R/R
−$4.9M−$4.9M± $0M exp surplusrealized −$13.6M 0.0± 0 exp WARrealized 1.5
Prior
no pedigree — league baseline → 0.21/yr
Evidence
recent form 3.5/yr over 1.5 season
Talent
2.05/yr blended
Horizon
0.0 control yr
NYYNYY Hardy Peterson net +$13.6M net -0.2
received +$40.0M+$40.0M ± $14M expected surplus · +$0.0M realized received 4.1 ± 2 expected · 1.3 realized WAR
Playoff odds: this deal moved NYY's 1990 odds 1% → 1% (+0.1 pts) — how trade timing is graded ↗
receives — most valuable first
Mike WittP·29y·R/R
+$39.6M+$39.6M± $14M exp surplusrealized +$0.0M 4.1± 2 exp WARrealized 1.3
Prior
no pedigree — league baseline → 0.21/yr
Evidence
recent form 3.9/yr over 2.5 seasons
Talent
2.73/yr blended
Horizon
1.5 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.