Rosternomics
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July 31, 2015

MILBAL

MIL won this trade +$92.8M surplus MIL won this trade +7.9 WAR
MILMIL Douglas Melvin net +$92.8M net +7.9
received +$1.6M+$1.6M ± $19M expected surplus · +$84.8M realized received 1.2 ± 2 expected · 7.5 realized WAR
Playoff odds: this deal moved MIL's 2015 odds 1% → 1% (+0.2 pts) — how trade timing is graded ↗
receives — most valuable first
Zach DaviesP·22y·R/R
+$1.8M+$1.8M± $19M exp surplusrealized +$84.8M 1.2± 2 exp WARrealized 7.5
Prior
#785 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
BALBAL Dan Duquette net −$92.8M net -7.9
received +$4.8M+$4.8M ± $11M expected surplus · −$8.0M realized received 1.2 ± 1 expected · -0.4 realized WAR
Playoff odds: this deal moved BAL's 2015 odds 16% → 14% (-2.2 pts) — how trade timing is graded ↗
receives — most valuable first
Gerardo ParraOF·28y·L/L
+$5.0M+$5.0M± $11M exp surplusrealized −$8.0M 1.2± 1 exp WARrealized -0.4
Prior
no pedigree — league baseline → 0.21/yr
Evidence
recent form 1.7/yr over 2.5 seasons
Talent
1.23/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.