MDCEV outside good definition

[Anna Reiffer]

Hi,

I am working on getting the MDCEV model going and am having some issues with my own data where the optimization does not converge, which I am now trying to trouble shoot.

I am trying to run different specifications and am wondering: How do I tell Biogeme which is the outside good for the generalized model and the gamma-profile model? Is it automatically the first alternative in the respective dictionary?

Thanks!

Anna

[Michel Bierlaire]

> On 20 Nov 2024, at 10:04, Anna Reiffer <annar...@gmail.com> wrote:
>
> Hi,
>
> I am working on getting the MDCEV model going and am having some issues with my own data where the optimization does not converge, which I am now trying to trouble shoot.
>
> I am trying to run different specifications and am wondering: How do I tell Biogeme which is the outside good for the generalized model and the gamma-profile model?

The gamma parameter should be set to None for the outside good.

gamma_parameters = {
10: None,
11: gamma_work,
12: gamma_school,
13: gamma_shopping,
14: gamma_dining,
15: gamma_hobby,

}



> Is it automatically the first alternative in the respective dictionary?
>
> Thanks!
> Anna
>

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Michel Bierlaire
Transport and Mobility Laboratory
School of Architecture, Civil and Environmental Engineering
EPFL - Ecole Polytechnique Fédérale de Lausanne
http://transp-or.epfl.ch
http://people.epfl.ch/michel.bierlaire