where: Thrp is the upper limit (Threshold) of the distance to controid, with p% of the cluster points included
while the position is a qualitative parameter.
Let us consider a parameter p which model the risk tolerance. If p value is set closed to 1, the risk tolerance is
high. If p value is closed to 0, than the risk tolerance is low. The risk index IR values which are higher than the p
parameter values (IR > p) will represent a high risk.
In order to exemplify the interpretation of risk index IR, several experiments were made (table 1).