Rosternomics
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July 26, 2018

MILCHW

MIL won this trade +$0.0M surplus MIL won this trade +0.5 WAR
MILMIL David Stearns net +$0.0M net +0.5
received +$1.6M+$1.6M ± $7M expected surplus · +$0.0M realized received 0.8 ± 1 expected · 0.5 realized WAR
Playoff odds: this deal moved MIL's 2018 odds 54% → 57% (+2.6 pts) — how trade timing is graded ↗
receives — most valuable first
Joakim SoriaP·34y·R/R
+$1.7M+$1.7M± $7M exp surplusrealized +$0.0M 0.8± 1 exp WARrealized 0.5
Prior
no pedigree — league baseline → 0.21/yr
Evidence
recent form 1.0/yr over 2.7 seasons
Talent
0.77/yr blended
Horizon
1.0 control yr
CHWCHW Kenny Williams net +$0.0M net -0.5
received +$28.0M+$28.0M ± $46M expected surplus · +$0.0M realized received 4.3 ± 6 expected · 0.0 realized WAR
Playoff odds: this deal moved CHW's 2018 odds 1% → 1% (-0.1 pts) — how trade timing is graded ↗
receives — most valuable first
Kodi MedeirosP·22y·L/L
+$27.6M+$27.6M± $46M exp surplusrealized +$0.0M 4.1± 6 exp WARrealized 0.0
Prior
#12 overall draft pick → 0.69/yr
Evidence
no MLB track record — leans on pedigree
Talent
0.69/yr blended
Horizon
6.0 control yrs
Wilber Perez
+$0.3M+$0.3M± $5M 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)

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.