Advanced analytics
Correlation Lab
Jordan Butler · Next-Day Readiness vs Zone 4–5 Minutes
Y: Oura · X: Polar
Not enough overlapping readings yet
A correlation needs at least 3 days where both metrics have real readings for this athlete. Days appear here once the athlete's devices sync — nothing is estimated.
Coefficient (r)
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Direction
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Sample size
0 day pairs
Date range
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Awaiting enough synced data to compute an association.
Saved Comparisons
Correlation does not establish causation. Sample sizes here are short-window and intended to guide staff conversations, not to justify clinical decisions. Only days with real synced readings from both sources count — nothing is imputed or estimated.