Rosternomics
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December 13, 2017

SEATBR

SEA won this trade +$5.6M surplus SEA won this trade +0.8 WAR
SEASEA Jerry Dipoto net +$5.6M net +0.8
received +$1.6M+$1.6M ± $21M expected surplus · +$5.6M realized received 1.2 ± 3 expected · 0.8 realized WAR
receives — most valuable first
Anthony MisiewiczP·23y·R/L
+$1.8M+$1.8M± $21M exp surplusrealized +$5.6M 1.2± 3 exp WARrealized 0.8
Prior
#545 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
TBRTBR Erik Neander net −$5.6M net -0.8
received +$0.0M+$0.0M ± $0M expected surplus · +$0.0M realized received 0.0 ± 0 expected · 0.0 realized WAR
receives — most valuable first
cash / PTBNL
+$0.0M+$0.0M± $0M exp surplusrealized +$0.0M 0.0± 0 exp WARrealized 0.0
Cash or player to be named — no projection

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.