How to find the type of association between the attributes when N = 180; (A) = 160, (β) = 130 and (αβ) = 6.
Step 1: Prepare a 9 square table.
Step 2: Using comparison method we note (AB) = 36
Step 3: [(A) x (B)] / N = [160 x 50] / 180 = 44.44
Since (AB) < [(A) x (B)] / N, we can say the attributes are negatively associated.
Association of Attributes can be Positive or Negative. When the presence of one attribute is associated with the absence of the other attribute then the attributes are negatively associated.
Using Comparison Method -
Attributes are independent when (AB) = (A) x (B) / N
Attributes are positively associated when (AB) > (A) x (B) / N
Attributes are negatively associated when (AB) < (A) x (B) / N