Rosternomics
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December 10, 2015

ATLSDP

ATL won this trade +$2.4M surplus ATL won this trade +0.4 WAR
ATLATL John Hart net +$2.4M net +0.4
received +$7.2M+$7.2M ± $15M expected surplus · +$0.8M realized received 1.4 ± 2 expected · 0.2 realized WAR
Playoff odds: this deal moved ATL's 2016 odds 1% → 1% (+0 pts) — how trade timing is graded ↗
receives — most valuable first
Casey KellyP·26y·R/R
+$6.8M+$6.8M± $14M exp surplusrealized +$0.8M 1.2± 2 exp WARrealized 0.2
Prior
#30 overall draft pick → 0.37/yr
Evidence
recent form -0.2/yr over 0.2 season
Talent
0.30/yr blended
Horizon
4.0 control yrs
Ricardo Rodríguez
+$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)
SDPSDP AJ Preller net −$2.4M net -0.4
received −$4.0M−$4.0M ± $29M expected surplus · −$1.6M realized received 0.0 ± 4 expected · -0.2 realized WAR
Playoff odds: this deal moved SDP's 2016 odds 0% → 0% (-0 pts) — how trade timing is graded ↗
receives — most valuable first
Christian BethancourtC·24y·R/R
−$3.7M−$3.7M± $29M exp surplusrealized −$1.6M 0.0± 4 exp WARrealized -0.2
Prior
Composite #69.0 pedigree (Baseball America #69 (2014)) — fell off 2 lists since, regressed — at the league baseline → 0.21/yr
Evidence
recent form -2.8/yr over 0.5 season
Talent
-0.67/yr blended
Horizon
5.0 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.