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PickleBALLER/docs/rating-comparison.md
Split 42d0269e56 Major refactor: Convert from Glicko-2 to pure ELO rating system 
- Created new ELO module (src/elo/) with:
  - Simple rating-only system (no RD or volatility tracking)
  - Standard ELO expected score calculation
  - Per-point performance scoring
  - Effective opponent formula for doubles
  - Full test suite (21 tests, all passing)

- Updated main.rs to use ELO calculator:
  - Per-point scoring: performance = points_scored / total_points
  - Effective opponent in doubles: Opp1 + Opp2 - Teammate
  - K-factor = 32 for casual play

- Created analysis tool (src/bin/elo_analysis.rs):
  - Reads match history from database
  - Recalculates all ratings using pure ELO
  - Generates before/after comparison (JSON + Markdown)

- Updated documentation:
  - New LaTeX report (rating-system-v3-elo.tex)
  - Simplified explanations (no volatility/RD complexity)
  - Plain English examples and use cases
  - FAQ section

- All tests passing (21/21 ELO tests)
- Code compiles without errors
- Release build successful
2026-02-26 11:35:07 -05:00

1.2 KiB
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Rating System Comparison: Glicko-2 vs Pure ELO

Summary

  • Total Players: 6
  • Total Matches: 29
  • Analysis Date: 2026-02-26 11:33:29

Ratings Comparison

Player Singles (G2) Singles (ELO) Diff Doubles (G2) Doubles (ELO) Diff Matches
Dane Sabo 1371 1500 +129 1209 1500 +291 0
Andrew Stricklin 1583 1500 -83 1718 1500 -218 0
Krzysztof Radziszeski 1619 1500 -119 1327 1500 +173 0
David Pabst 1462 1500 +38 1661 1500 -161 0
Jacklyn Wyszynski 1500 1500 +0 1615 1500 -115 0
Eliana Crew 1465 1500 +35 1506 1500 -6 0

Biggest Rating Changes

Players whose ratings changed the most in the conversion:

  1. Dane Sabo - Average change: 210 points
    • Singles: +129
    • Doubles: +291
  2. Andrew Stricklin - Average change: 151 points
    • Singles: -83
    • Doubles: -218
  3. **Krzysztof Radziszeski ** - Average change: 146 points
    • Singles: -119
    • Doubles: +173
  4. David Pabst - Average change: 100 points
    • Singles: +38
    • Doubles: -161
  5. Jacklyn Wyszynski - Average change: 57 points
    • Singles: +0
    • Doubles: -115