Rosternomics
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December 20, 2017

SFGTBR

SFG won this trade +$23.2M surplus SFG won this trade +5.7 WAR
SFGSFG Brian Sabean net +$23.2M net +5.7
received +$21.6M+$21.6M ± $11M expected surplus · +$20.0M realized received 2.6 ± 1 expected · 6.7 realized WAR
Playoff odds: this deal moved SFG's 2018 odds 1% → 1% (-0.1 pts) — how trade timing is graded ↗
receives — most valuable first
Evan Longoria3B·32y·R/R
+$21.4M+$21.4M± $11M exp surplusrealized +$20.0M 2.6± 1 exp WARrealized 6.7
Prior
league baseline (track record outweighs draft pedigree) → 0.26/yr
Evidence
recent form 3.7/yr over 2.7 seasons
Talent
2.65/yr blended
Horizon
1.0 control yr
TBRTBR Erik Neander net −$23.2M net -5.7
received +$6.4M+$6.4M ± $41M expected surplus · −$3.2M realized received 4.2 ± 5 expected · 1.0 realized WAR
Playoff odds: this deal moved TBR's 2018 odds 58% → 60% (+2.6 pts) — how trade timing is graded ↗
receives — most valuable first
Matt KrookP·23y·L/L
+$9.4M+$9.4M± $21M exp surplusrealized +$0.0M 1.7± 3 exp WARrealized 0.0
Prior
#35 overall draft pick → 0.30/yr
Evidence
no MLB track record — leans on pedigree
Talent
0.30/yr blended
Horizon
5.5 control yrs
Stephen WoodsP·23y·R/R
+$2.3M+$2.3M± $22M exp surplusrealized +$0.0M 1.3± 3 exp WARrealized 0.0
Prior
#188 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
Denard SpanOF·34y·L/L
−$0.8M−$0.8M± $11M exp surplusrealized −$4.8M 1.2± 1 exp WARrealized 0.6
Prior
league baseline (track record outweighs draft pedigree) → 0.24/yr
Evidence
recent form 1.7/yr over 2.3 seasons
Talent
1.21/yr blended
Horizon
1.0 control yr
Christian Arroyo2B·23y·R/R
−$4.5M−$4.5M± $25M exp surplusrealized +$1.6M 0.0± 3 exp WARrealized 0.4
Prior
#25 overall draft pick → 0.41/yr
Evidence
recent form -2.8/yr over 0.2 season
Talent
-0.09/yr blended
Horizon
5.5 control yrs

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.