As a measure of the intensity of association between two attributes A and B, G. Udny Yule gave the coefficient of association Q, defined as follows:
If A and B are independent, δ= 0 à Q= 0.
If A and B are completely associated, then
Either (AB) = (A) à (Aβ) = 0
Or (AB) =(B) à (αB) = 0
And in each case Q = +1.
If A and B are in complete dissociation then either (AB) = 0 or (αβ) = 0 and we get Q = -1.
Hence, -1 ≤ Q ≤ 1
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