How to find the type of association between the attributes?

Question:

How to find the type of association between the attributes when N = 180; (A) = 160, (β) = 130 and (αβ) = 6.

Solution:

Step 1: Prepare a 9 square table.

	B	β	Total
A	36	124	160
α	14	6	20
Total	50	​130	180

Step 2: Using comparison method we note (AB) = 36

Step 3: [(A) x (B)] / N = [160 x 50] / 180 = 44.44

Answer:

Since (AB) < [(A) x (B)] / N, we can say the attributes are negatively associated.

Concept:

• 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 -

1. Attributes are independent when (AB) = (A) x (B) / N

2. Attributes are positively associated when (AB) > (A) x (B) / N

3. Attributes are negatively associated when (AB) < (A) x (B) / N

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