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10 cards from this deck
It measures the strength of relationship between ranks.
The range is from -1 to +1.
Assign them the average of their ranks.
r_s = 1 - (6Σd²)/(n(n²-1))
d² = 4.
A strong positive correlation.
Perfect negative correlation.
It focuses on ranks, not actual values.
Rank your data first.
A weak correlation.
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