| name | sabermetrics-calc |
| description | This skill should be used when the user asks about sabermetric formulas, "what is wOBA", "how to calculate FIP", "explain wRC+", college baseball advanced stats, or wants to compute sabermetric values from raw stats. Provides formulas, explanations, and calculations for all major sabermetric metrics. |
| version | 1.0.0 |
Sabermetrics Calculator
Calculates, explains, and applies advanced sabermetric formulas for college baseball analytics.
When This Skill Applies
This skill activates when the user:
- Asks what a sabermetric stat means (wOBA, FIP, wRC+, BABIP, etc.)
- Wants to calculate a metric from raw stats
- Needs to evaluate a player using advanced metrics
- Compares traditional stats vs. sabermetrics
- Asks about college baseball analytics methodology
Core Formulas
wOBA (Weighted On-Base Average)
wOBA = (0.69×uBB + 0.72×HBP + 0.89×1B + 1.27×2B + 1.62×3B + 2.10×HR) / (AB + BB - IBB + SF + HBP)
- League average: ~.320
- Excellent: >.400
- NCAA weights may vary slightly from MLB — adjust for college run environment
FIP (Fielding Independent Pitching)
FIP = ((13×HR) + (3×(BB+HBP)) - (2×K)) / IP + FIP_constant
- FIP constant ≈ 3.10 (adjusts to league ERA each season)
- College FIP constant recalculated per season for NCAA environment
wRC+ (Weighted Runs Created Plus)
wRC+ = (((wRAA/PA + league_runs_per_PA) + (league_runs_per_PA - park_factor × league_runs_per_PA)) / (league_wRC/PA)) × 100
- 100 = league average
- 150+ = elite
- College: park factors vary significantly — use with context
BABIP (Batting Average on Balls in Play)
BABIP = (H - HR) / (AB - K - HR + SF)
- League average: ~.300
- Significant deviation may indicate luck, defense quality, or batted-ball skill
ISO (Isolated Power)
ISO = SLG - AVG
- Or equivalently: (2B + 2×3B + 3×HR) / AB
Barrel Rate
Barrel% = Barrels / Batted Ball Events × 100
- A barrel: exit velocity ≥ 98 mph and optimal launch angle (26-30° at 98 mph, wider range at higher velo)
CSW% (Called Strike + Whiff %)
CSW% = (Called Strikes + Whiffs) / Total Pitches × 100
- Average: ~28-29%
- Elite: >32%
Instructions
When this skill is invoked:
- Identify which metric(s) the user is asking about
- Provide the formula with clear variable definitions
- If raw stats are given, compute the result
- Contextualize the result (what's good, average, elite in college baseball)
- Note any college-specific adjustments vs. MLB formulas
College Baseball Context
- College baseball uses aluminum bats (BBCOR since 2011) — higher BABIP and offensive levels than MLB
- Smaller sample sizes per season (~56 games vs. 162) — more variance in rate stats
- Park factors vary wildly between programs
- Pitcher workload limits differ from pro ball
- wOBA weights should be recalibrated for the college run environment
