The arm_outfield function had thresholds designed for bis_runs_outfield,
but retrosheet_data.py uses tz_runs_total (different scale).
Issue: 20 players had -6 arm (top rating) - should be exceptionally rare
Analysis of tz_runs_total distribution:
- Ranges from -8 to +23 (not -10 to +10)
- Old threshold: > 8 gave 20 players with -6 arm
- New threshold: > 18 gives ~2-3 players with -6 arm
Updated thresholds to properly map tz_runs_total values to arm ratings:
- > 18: -6 (exceptional, top 2-3 players like Andruw Jones)
- > 14: -5 (elite arms, ~5-8 players)
- > 10: -4 (very good)
- Graduated scale down to +2 for very poor arms
Result: -6 arms now truly exceptional, proper distribution across ratings
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
