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10 cards from this deck
Strength of relationship using data rankings, not values.
Between -1 and +1, indicating type of correlation.
+1, as one variable increases, so does the other.
rs = 1 - (6Σd²)/(n(n² - 1))
Use the average of ranks for tied values.
Subtract ranks of paired data points.
Add all squared differences of rank pairs.
rs value between 0.6 and 1.0.
No correlation between variables.
To focus on relative position, not actual values.
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