How to indicate some alternatives belong to one group

[yufei xu]

Dear Professor Bellaire,

I am currently working on a data file with 981 alternatives. I use the alternative sampling method, which means for each observation it will have 1 chosen alternative and 30 non-chosen alternatives. I would like to know if it is possible to indicate the model that these 30 non-chosen alternatives belong to this specific observation in Biogeme?

Thanks for your help!

Yufei

[Bierlaire Michel]

I don’t understand the question. Sampling of alternatives is a pre-processing. You need to generate your data file using the procedure that you describe. Note that the sampling of alternatives should be made for each observation. 

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