Two attributes A and B are said to be independent if there exists no relationship of any kind between them. If A and B are independent, we would expect
If A and B are independent, then (i) gives
Which is (2). Similarly, starting from (2), we would arrive at (1).
It becomes easier to grasp the nature of the above relations if the frequencies are supposed to be grouped into a table with two rows and two columns as follows:
Second criterion of independence may be obtained in terms of the class frequencies of first order. (3) gives
Which leads to the following important fundamental rule:
“if the attributes A and B are independent, the proportion of AB’s in the population is equal to the product of the proportions of A’s and B’s in the population.”
We may obtain a third criterion of independence in terms of second order class frequencies, as follows.
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