Message · Significance
How many data points are needed for significance?
A single range session tells you nothing, three rounds suggest trends, ten data points allow for real conclusions. What statistical significance means for senior golf measurement — and when a change is truly an improvement.
MA three-circle drill suddenly yielded 50 percent instead of 27 percent after 6 weeks of training. Enthusiasm – until I honestly read my training diary: I had only done a single drill per week. After 10 drills, the average was 38 percent. Improvement was real, but smaller than the single outlier suggested. Statistics protect against self-deception.
Statistical significance in the context of senior golf means: When is a measured change likely not due to chance? A player's daily form naturally fluctuates by ±3-5 strokes per round, and drill success rates vary by ±10-15 percentage points. Only when trends are consistent across multiple data points can one speak of improvement.
Three significance thresholds
Three Examples of Samples Specific to Seniors
Three data points can be misleading. Ten cannot. Senior golfers who follow this principle spare themselves countless false conclusions about their game.
— Mark Broadie, Strokes Gained Researcher
Three Principles of Statistical Discipline for Seniors.
10 is the magic number
Ten data points per KPI is the practical minimum sample size. Any fewer is hit-or-miss; any more is excessive.
Patience Before Reaction
Don't overreact to a single bad round. Only take action after 3–5 bad rounds in a row.
Use comparison periods
Weeks 1–3 vs. Weeks 8–10. First half vs. second half. Pre-training vs. post-training. Comparative analysis yields insights.
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What Statistical Discipline Cannot Replace
Statistics help with interpretation—but they don't replace practice itself. Someone who calculates perfectly but doesn't practice has excellent statistics without any improvement. Statistics + practice + patience = the complete Senior Method.
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