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Paper #6PlannedMLB

The Park Factor Problem: How Public Stat Sites Get Coors Field Wrong by 12%

Traditional park factors (Baseball Reference, FanGraphs) compress park effects badly. Quantifying the bettor edge from altitude + weather + handedness park factors.

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What's in the paper

  • ~15-20 page PDF, citation-ready
  • Full methodology, reproducible from any pick history with the same fields
  • Print-resolution charts (bucket analysis, cross-version scatter, regression face-off)
  • Robustness appendix — bootstrap CIs, sample-size convergence, version cross-validation
  • Glossary + references to academic literature

Data used

Every field that goes into the analysis. Open methodology — you can reproduce this paper from any pick history with these columns.

FieldTypeSourceWhat it means
park_idTEXTmlb_parksStadium identifier.
park_nameTEXTmlb_parksFriendly stadium name.
seasonINTmlb_parksSeason year.
br_park_factorNUMERIC(5,1)baseball_referencePublic Baseball Reference park factor (the comp we beat).
fangraphs_park_factorNUMERIC(5,1)fangraphsPublic FanGraphs park factor (the other comp).
altitude_ftINTweather_parkStadium altitude above sea level.
avg_temp_fNUMERIC(4,1)weather_parkMean game-time temperature for the season.
avg_humidity_pctNUMERIC(4,1)weather_parkMean humidity at first pitch.
avg_wind_mphNUMERIC(4,1)weather_parkMean wind speed at first pitch.
wind_direction_avg_degNUMERIC(4,1)weather_parkMean wind direction (0–360 degrees, 0 = north).
lhp_runs_per_gameNUMERIC(4,2)derived from statcastAverage runs scored when a left-handed pitcher starts.
rhp_runs_per_gameNUMERIC(4,2)derived from statcastAverage runs scored when a right-handed pitcher starts.
corrected_park_factorNUMERIC(5,1)derivedOur blended park factor — altitude + weather + handedness combined.
corrected_minus_brNUMERIC(5,1)derivedHow much our factor differs from BR’s. The actionable signal.