Choice Modelling with unequal choice sets

[prakash gawas]

Dear Professor Bierlaire,

I am new at choice modelling and trying to see whats the best for my problem.

Is there any example that shows how to model for unequal choice sets. Can Biogeme be even used here?

I have a problem where customers are offered products in a sequential manner. Whatever remains after the first customers decision than goes to second and so on till all products exhausted. I did find a python package 'pylogit' that can handle unequal sets.

Many thanks!

[Bierlaire Michel]

On 10 Jun 2021, at 19:20, prakash gawas <gunne...@gmail.com> wrote:

Dear Professor Bierlaire,

I am new at choice modelling and trying to see whats the best for my problem.

Is there any example that shows how to model for unequal choice sets. Can Biogeme be even used here?

Sure. You need to define an availability condition for each alternative. See the examples online.

http://biogeme.epfl.ch/examples.html#swissmetro

I have a problem where customers are offered products in a sequential manner. Whatever remains after the first customers decision than goes to second and so on till all products exhausted. I did find a python package 'pylogit' that can handle unequal sets.

Many thanks!

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[prakash gawas]

I have another issue. There is also a no purchase option. In making the model I give attributes of the alternatives as input to the the model. Do I have to explicitly give the no purchase option as input to the model (in which case what will be its attribute ) or leave all choices as zero(I guess which will be error)?

[Bierlaire Michel]

The utility of the no purchase alternative can be normalized to zero. 

You may want to consider the online course: https://www.edx.org/course/introduction-to-discrete-choice-models

To view this discussion on the web visit https://groups.google.com/d/msgid/biogeme/bbd0f786-b804-4ce4-a494-d47c5aec56e5n%40googlegroups.com.