The McLoone Index divides the summation of all observations below the median, by the median multiplied by the number of observations below the median.

Example:

number of employees --- salary

2 --- 1000

4 --- 200

6 --- 100

6 --- 60

8 --- 45

12 --- 24

In this example, the summation of observations below the median = 603, and the median = 45 Thus, the McLoone Index = 603/(45(19)) = .7053