The scaling parameters (λ) must be defined as alternative-specific constants at the nodes of the model structure. They must become greater from top to bottom within the model structure, i.e. at a node N, the scaling parameter must be at least as great as the scaling parameter of the overlying node in the model structure., i. e. for λ at the parent node the following applies:
Applied to the persons' choice decisions, this means that decisions at nodes further down the decision tree are more sensitive than decisions at nodes further up the decision tree.
On the levels with nodes for destination choice, you can only specify one scaling parameter. In this case, you cannot define scaling parameters per alternative (destination zone).
