ABSTRACT
This chapter provides an overview of the Network GEV (NetGEV) model and highlights several of its key properties. It concludes with a detailed example of a NetGEV model of airline itinerary choice based on synthetic data and with an Appendix that provides an example that is used to illustrate how complex normalization rules can become if a general network structure is used. The chapter presents the normalization rules that are just one of many possible normalization rules. A crash free network is one in which multiple pieces of the same alternative are recombined only at the root node. In a crash free network, partial alternatives are recombined at the root node and no crashes occur, as there is no opportunity for internal correlation at intermediate nodes. The NetGEV model also needs normalization rules for logsum parameters and allocation parameters.
