Rosternomics
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October 24, 2015

PITMIA

PIT won this trade +$41.6M surplus PIT won this trade +5.4 WAR
PITPIT Neal Huntington net +$41.6M net +5.4
received +$1.6M+$1.6M ± $18M expected surplus · +$41.6M realized received 1.2 ± 2 expected · 5.4 realized WAR
Playoff odds: this deal moved PIT's 2016 odds 9% → 8% (-0.4 pts) — how trade timing is graded ↗
receives — most valuable first
Trevor WilliamsP·24y·R/R
+$1.8M+$1.8M± $18M exp surplusrealized +$41.6M 1.2± 2 exp WARrealized 5.4
Prior
#44 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
MIAMIA Mike Berger net −$41.6M net -5.4
received +$0.0M+$0.0M ± $6M expected surplus · +$0.0M realized received 0.2 ± 1 expected · 0.0 realized WAR
Playoff odds: this deal moved MIA's 2016 odds 22% → 23% (+0.9 pts) — how trade timing is graded ↗
receives — most valuable first
Richard Mitchell
+$0.3M+$0.3M± $6M 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.