When no more information about the future can be found, a more useful value
may be the difference between the result of using an expected value solution and
the recourse problem solution. We call this the value of the stochastic solution
(VSS), where
Value of Stochastic Solution: the difference between the solution
of an SP program and the expected value of the objective
function when we fix parameters to average values and use the
corresponding optimal solution.
Assume that the 4 scenarios occur with equal probability
Take the weighted (by probability) average of the optimal objective value for each scenario