Rosternomics
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December 10, 2020

MIAARI

MIA won this trade +$2.4M surplus MIA won this trade +0.6 WAR
MIAMIA Michael Hill net +$2.4M net +0.6
received +$1.6M+$1.6M ± $20M expected surplus · +$2.4M realized received 1.2 ± 2 expected · 0.6 realized WAR
Playoff odds: this deal moved MIA's 2021 odds 2% → 2% (+0.1 pts) — how trade timing is graded ↗
receives — most valuable first
Zach PopP·24y·R/R
+$1.8M+$1.8M± $20M exp surplusrealized +$2.4M 1.2± 2 exp WARrealized 0.6
Prior
#220 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
ARIARI Mike Hazen net −$2.4M net -0.6
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 ARI's 2021 odds 0% → 0% (-0 pts) — how trade timing is graded ↗
receives — most valuable first
Tyler Jones
+$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.