Rosternomics
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July 27, 2007

SDPARI

SDP won this trade +$48.0M surplus SDP won this trade +5.0 WAR
SDPSDP Kevin Towers net +$48.0M net +5.0
received −$2.4M−$2.4M ± $18M expected surplus · +$46.4M realized received 0.0 ± 2 expected · 5.2 realized WAR
Playoff odds: this deal moved SDP's 2007 odds 29% → 34% (+4.4 pts) — how trade timing is graded ↗
receives — most valuable first
Scott HairstonOF·27y·R/R
−$2.2M−$2.2M± $18M exp surplusrealized +$46.4M 0.0± 2 exp WARrealized 5.2
Prior
league baseline (track record outweighs draft pedigree) → 0.21/yr
Evidence
recent form -1.0/yr over 0.4 season
Talent
-0.11/yr blended
Horizon
3.0 control yrs
ARIARI Josh Byrnes net −$48.0M net -5.0
received +$1.6M+$1.6M ± $21M expected surplus · −$1.6M realized received 1.1 ± 3 expected · 0.2 realized WAR
Playoff odds: this deal moved ARI's 2007 odds 3% → 3% (-0.6 pts) — how trade timing is graded ↗
receives — most valuable first
Leo RosalesP·26y·R/R
+$1.3M+$1.3M± $21M exp surplusrealized −$1.6M 1.1± 3 exp WARrealized 0.2
Prior
#581 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 × 0.94 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.