For gap calculation, inputs are used that are defined in a Nested demand procedure. You need to define a reference to such a procedure. The cost-weighed relative deviation of current demand from the demand of the last iteration is calculated.
where:
|
Tnew |
Demand of current iteration |
|
Told |
Demand of last iteration |
|
Ua |
Utility of alternative |
|
a |
Index of all demand strata and alternatives (modes, time-of-day choice, destination zones) |
A prerequisite for gap calculation is that the values of utilities in the Nested demand procedure are smaller than or equal to zero.
