conventional levels of significance, like the famous 5 percent rejection intervals, are widely used. The
decision maker decides the discordance threshold, that is he decides whether a hypothesis must be rejected
or not.
If the discordance test is not passed alternatives a and b are said incomparable. They are too different to be
compared. Taking into account both the concordance and the discordance test we construct a binary
outranking relation S. Given two generic retail companies ( i R , j R ) we say that i R outranks j R if and
only if the concordance test ( c T ) and the discordance test ( d T ) are fulfilled, that is:
i