Rosternomics
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August 10, 2018

MIAPHI

MIA won this trade +$1.6M surplus MIA won this trade +0.2 WAR
MIAMIA Michael Hill net +$1.6M net +0.2
received +$2.4M+$2.4M ± $22M expected surplus · +$0.0M realized received 1.3 ± 3 expected · 0.0 realized WAR
Playoff odds: this deal moved MIA's 2018 odds 0% → 0% (+0 pts) — how trade timing is graded ↗
receives — most valuable first
McKenzie MillsP·22y·L/L
+$2.3M+$2.3M± $22M exp surplusrealized +$0.0M 1.3± 3 exp WARrealized 0.0
Prior
#544 overall draft pick — at the league baseline → 0.21/yr
Evidence
no MLB track record — leans on pedigree
Talent
0.21/yr blended
Horizon
6.0 control yrs
PHIPHI Matt Klentak net −$1.6M net -0.2
received +$10.4M+$10.4M ± $29M expected surplus · −$1.6M realized received 3.6 ± 4 expected · -0.2 realized WAR
Playoff odds: this deal moved PHI's 2018 odds 10% → 9% (-0.5 pts) — how trade timing is graded ↗
receives — most valuable first
Justin Bour1B·30y·L/R
+$10.6M+$10.6M± $29M exp surplusrealized −$1.6M 3.6± 4 exp WARrealized -0.2
Prior
league baseline (track record outweighs draft pedigree) → 0.21/yr
Evidence
recent form 2.2/yr over 1.5 season
Talent
1.30/yr blended
Horizon
3.0 control yrs × 0.92 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.