How to find the type of association between the attributes?

Question:

How to find the type of association between the attributes when N = 126; (A) = 90, (B) = 56 and (AB) = 40.


Solution:

Step 1: Using comparison method we note (AB) = 40.

Step 2: [(A) x (B)] / N = [90 x 56] / 126 = 40.


Answer:

Since (AB) = [(A) x (B)] / N, we can say the attributes are independent.


Concept:

  • Two attributes are said to be independent if there does not exist any kind of relation between them. 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


Video Solution:


How to find the type of association between the attributes with a Solved Example from Theory of Attributes