Figure 3. First order sensitivity indices defined as the fraction of the total variance in system behavior caused by the variation in each parameter value under constant .

Calculations were performed for a 12-parameter vector V = [, , , , , , , , , , , ], using the FAST method and under the assumption that parameters are varied uniformly by no more than 25%. Due to vast differences in relative importance of different parameters, the results are reported (a) together and (b–e) on four separate graphs, grouped by the order of magnitude of the corresponding sensitivity index; only parameters with sensitivity indices over 1% are reported.