Contingency reference The first issue concerns how to determine X, the estimated total cost. In this setting we will call this the “contingency reference”. DynRisk offers three different options for calculating this: • Base value • Mean value • 50/50-value The “Base value” is the value of the total cost if all uncertainty is neglected. The “Mean value” is obtained by calculating the mean of all the simulation values. The “50/50-value” is the same as the median of the simulation values.