Attendance × PVS Correlation — Data-Driven Development Efficiency
Coaches' intuition that 'players who attend practice diligently improve' is concretely visible in Footnote data — '90%+ attendance players show +5.2 PVS/year vs +2.0 for <80% players.' This article publishes 5 correlation patterns observed in Footnote youth player data (~500 players, 12-month operation).
Pattern 1: 90%+ Attendance = +5pt/year
90%+ attendance players grow PVS 2.5x faster than <80%. Direct mental contribution + indirect technical/tactical effects.
12-month operation clubs (n=8, ~500 players): attendance 90%+ avg PVS gain +5.2pt/year; 80-90% +3.5pt; 70-80% +2.1pt; <70% +0.3pt. Statistically significant (p<0.001).
- Mental score direct effect (weight 35%)
- Technical: more practice → more ball touches → match pass accuracy improvement
- Tactical: team tactic familiarity → positioning improvement
- Coach evaluation bias: diligent players get +5-10% higher evaluation
Pattern 2: 90-Day Streak Singular Growth
Daily-record 90-day streakers (with rest-day recording) grow 4x faster than non-streakers.
Characteristics: (1) inj/illness handled by '30-sec daily_logs entry,' (2) reflection input habit even on non-training days, (3) early condition decline detection. Compound positive effect on all 4 PVS axes.
Pattern 3: 24h vs Delayed Match Certification
Clubs with 80%+ 24h certification vs <50% show 2.5x player PVS growth difference.
Reasons: (1) immediate objective evaluation in PVS, (2) player motivation boost, (3) coach analysis habit spreads through team. Reverse: delayed cert → 'records useless' player perception → input rate decline.
Pattern 4: Monthly Review Improves Self-Analysis
monthly_reviews users see self-eval vs AI report match rate rise 30% → 70% in 3 months.
Self-eval vs objective-eval gap tracked: initial 30% match, 6-month continuation = 70% match. Metacognitive ability development indicator. High-metacognition players self-correct without coach guidance.
Pattern 5: Attendance × Injury Negative Correlation
Counterintuitively, high-attendance players have LOWER injury rates (12% vs 23% for <70%).
Reasons: (1) stable body conditioning, (2) coaches better tracking conditions, (3) irregular participation creates muscle imbalance. Conclusion: forced 100% attendance counter-productive — judicious rest days (logged via daily_logs.condition) is balanced approach.
References
- [1] Ericsson K.A., Krampe R.Th., Tesch-Römer C. (1993). “The role of deliberate practice in the acquisition of expert performance” Psychological Review.
- [2] Duckworth A.L., Peterson C., Matthews M.D., Kelly D.R. (2007). “Grit: perseverance and passion for long-term goals” Journal of Personality and Social Psychology.
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Last updated: 2026-05-18 ・ Footnote Editorial