Calculation of the Index of Dissimilarity
This example considers 10 airports and their respective
share of the total number airports (X) and of the traffic (Y). In this
case, there is an unequal distribution of traffic with the three largest
airports accounting for 60% of the market. The largest airport accounts
for 25% of the market while the smallest accounts for only 2%. This
distribution is fairly unequal with an index of dissimilarity (ID; the
sum of all differences from the line of perfect equality, X-Y) of 0.325.