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Welcome to the users group for Biogeme. Submit your questions, comments, suggestions. Please take the time as well to respond to other users questions.

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aaditya bhamidipati, Bierlaire Michel2

6/22/20

premature temination

Why did you fix the sigma's to 1? On 21 Jun 2020, at 13:20, aaditya bhamidipati <aadityabh12@

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premature temination

Why did you fix the sigma's to 1? On 21 Jun 2020, at 13:20, aaditya bhamidipati <aadityabh12@

6/22/20

zh.kev...@gmail.com, Jason Hawkins2

3/9/20

Choice model based on revealed preference is under certainty, risk or uncertainty

Hi Kevin, You are correct that the error term generally refers to uncertainty on the part of the

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Choice model based on revealed preference is under certainty, risk or uncertainty

Hi Kevin, You are correct that the error term generally refers to uncertainty on the part of the

3/9/20

Valeriy, Ercan Kurtuluş2

7/11/19

Estimation the random heterogeneity model

It appears that you defined same error component for each alternative. You should define different

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Estimation the random heterogeneity model

It appears that you defined same error component for each alternative. You should define different

7/11/19

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Gabriel Nova Sepulveda, Michel Bierlaire3

12/9/25

maximum_number_parameters in assisted specification

I defined the max number of parameters in catalog/specification.py and worked self.

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maximum_number_parameters in assisted specification

I defined the max number of parameters in catalog/specification.py and worked self.

12/9/25

Amneh Nassar, Michel Bierlaire2

11/24/25

Issue with Mixed Logit Model Combining Panel effect

Try to increase the initial value of the standard deviation parameters. A value of 1 is sometimes

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Issue with Mixed Logit Model Combining Panel effect

Try to increase the initial value of the standard deviation parameters. A value of 1 is sometimes

11/24/25

shad...@gmail.com

11/21/25

Correction term for alternative sampling

Dear Michel, I'm estimating an MNL model with over 1000 alternatives, so I need to perform

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Correction term for alternative sampling

Dear Michel, I'm estimating an MNL model with over 1000 alternatives, so I need to perform

11/21/25

Kevin Dj, Michel Bierlaire4

11/5/25

Apollo vs. BIOGEME comparison

The tolerance for the convergence can always be decreased. The default value is tolerance =

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Apollo vs. BIOGEME comparison

The tolerance for the convergence can always be decreased. The default value is tolerance =

11/5/25

Michel Bierlaire

11/3/25

Re: Question about panel structure in hybrid choice model (Biogeme)

Dear Eleni, Estimating such a complex model with a panel setting is almost hopeless. Ignore the panel

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Re: Question about panel structure in hybrid choice model (Biogeme)

Dear Eleni, Estimating such a complex model with a panel setting is almost hopeless. Ignore the panel

11/3/25

Tariq Naveed, Michel Bierlaire2

10/27/25

[biogeme] Memory Allocating Error

I would definitely move to linux, and use no second derivatives. Also, sequential estimation is

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[biogeme] Memory Allocating Error

I would definitely move to linux, and use no second derivatives. Also, sequential estimation is

10/27/25

Bhattarai Dinesh, … John Abraham3

10/17/25

Try Python 3.13 or Python 3.12. Usually when my Mac tries to compile something from source it's

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Try Python 3.13 or Python 3.12. Usually when my Mac tries to compile something from source it's

10/17/25

Matthias, Michel Bierlaire2

10/5/25

Panel data error in RP/SP model

The 4 messages are OK. I did not discover why they are displayed 4 times, but it works for me. There

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Panel data error in RP/SP model

The 4 messages are OK. I did not discover why they are displayed 4 times, but it works for me. There

10/5/25

9/29/25

Handling Nested Logit with Varying Availability in Ranked Choice Data

Dear Professor Bierlaire, I hope you are doing well. I am working on a choice model with five

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Handling Nested Logit with Varying Availability in Ranked Choice Data

Dear Professor Bierlaire, I hope you are doing well. I am working on a choice model with five

9/29/25

Tariq Naveed, Michel Bierlaire3

9/9/25

Memory Allocating Error

Thanks a lot. Yours sincerely, Tariq Naveed PhD student University of Cagliari On Tue, Sep 9, 2025 at

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Memory Allocating Error

Thanks a lot. Yours sincerely, Tariq Naveed PhD student University of Cagliari On Tue, Sep 9, 2025 at

9/9/25

8/23/25

Multinomial Logit Model - Unexpected Estimated Parameter Results

Hello, I've developed a multinomial logit model that estimates a coefficient for time (delivery

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Multinomial Logit Model - Unexpected Estimated Parameter Results

Hello, I've developed a multinomial logit model that estimates a coefficient for time (delivery

8/23/25

YQ WANG, Michel Bierlaire3

8/7/25

Question Regarding Multi-Level Nested Logit Model Specification in Biogeme

Multi-level nested logit are not implemented as such in biogeme, because they are not useful. You

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Question Regarding Multi-Level Nested Logit Model Specification in Biogeme

Multi-level nested logit are not implemented as such in biogeme, because they are not useful. You

8/7/25

AKINFILOYE EBENEZER, Michel Bierlaire2

8/6/25

Swissmetro Dataset

All data sets are available here: https://biogeme.epfl.ch/#data Swissmetro is also distributed with

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Swissmetro Dataset

All data sets are available here: https://biogeme.epfl.ch/#data Swissmetro is also distributed with

8/6/25

YQ WANG, Michel Bierlaire2

8/4/25

numerical issues

If those are only warnings you can ignore them. But make sure to verify that the final solution makes

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numerical issues

If those are only warnings you can ignore them. But make sure to verify that the final solution makes

8/4/25

Ali Karami, Michel Bierlaire2

8/4/25

Question on Threshold Parameter Specification in Hybrid Choice Model in Biogeme

Usually, the set of thresholds is the same across indicators, as the measurement equations are meant

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Question on Threshold Parameter Specification in Hybrid Choice Model in Biogeme

Usually, the set of thresholds is the same across indicators, as the measurement equations are meant

8/4/25

7/31/25

Request for Guidance on Hybrid Choice Model Implementation in Python Biogeme

Dear Prof. Bierlaire, I hope this email finds you well. First of all, I would like to sincerely thank

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Request for Guidance on Hybrid Choice Model Implementation in Python Biogeme

Dear Prof. Bierlaire, I hope this email finds you well. First of all, I would like to sincerely thank

7/31/25

Sourav Kr Mandal, Michel Bierlaire2

7/16/25

Large Parameters estimation in Latent Class Choice Model

> On 15 Jul 2025, at 20:39, Sourav Kr Mandal <mandals...@gmail.com> wrote: > >

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Large Parameters estimation in Latent Class Choice Model

> On 15 Jul 2025, at 20:39, Sourav Kr Mandal <mandals...@gmail.com> wrote: > >

7/16/25

7/1/25

Discrete Choice Model (0,1)

I have been trying to use Biogeme library to model the discrete Choice model between 2 options (

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Discrete Choice Model (0,1)

I have been trying to use Biogeme library to model the discrete Choice model between 2 options (

7/1/25

Natchaphon Leungbootnak, Michel Bierlaire4

6/28/25

Calculation of Class Membership in Latent Class Logit Model

If you want to guess the class from the data (that is, both the independent variables and the choice)

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Calculation of Class Membership in Latent Class Logit Model

If you want to guess the class from the data (that is, both the independent variables and the choice)

6/28/25

Chris ten Dam, Michel Bierlaire3

6/14/25

1.8E+308 stds with loglikelihoodregression models

> On 14 Jun 2025, at 09:16, Chris ten Dam <chrisdjie...@gmail.com> wrote: > >

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1.8E+308 stds with loglikelihoodregression models

> On 14 Jun 2025, at 09:16, Chris ten Dam <chrisdjie...@gmail.com> wrote: > >

6/14/25

5/20/25

Ordered Logit Model with Panel Data in BIOGEME

Dear Prof. Bierlaire and BIOGEME community, I am a M.Sc. Engg. student. I've designed a stated

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Ordered Logit Model with Panel Data in BIOGEME

Dear Prof. Bierlaire and BIOGEME community, I am a M.Sc. Engg. student. I've designed a stated

5/20/25

Osama Hassan, … Tito Henry4

5/2/25

Inquiry about the test file

Dear Dr Michael, Therefore, rho squared for initial model isn't reference at all , either I run

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Inquiry about the test file

Dear Dr Michael, Therefore, rho squared for initial model isn't reference at all , either I run

5/2/25

5/1/25

Latent variable and panel data

Hello, I am doing a model with a latent variable with an error component normally distributed and I

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Latent variable and panel data

Hello, I am doing a model with a latent variable with an error component normally distributed and I

5/1/25

ענבל גליקמן

5/1/25

Issue with HCM Combining Latent variable and Panel effect

Dear Prof. Berlier, I need your assistance with an issue I am encountering while estimating a HCM

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Issue with HCM Combining Latent variable and Panel effect

Dear Prof. Berlier, I need your assistance with an issue I am encountering while estimating a HCM

5/1/25

Natchaphon Leungbootnak, Michel Bierlaire2

4/28/25

Inquiry about Y Prediction Calculation

Accuracy percentage and confusion matrices are just nonsense. The only context where considering the

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Inquiry about Y Prediction Calculation

Accuracy percentage and confusion matrices are just nonsense. The only context where considering the

4/28/25

4/24/25

How to properly model and identify panel effect in Biogeme?

Dear all, I'm currently working with panel data in Biogeme and trying to understand how to

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How to properly model and identify panel effect in Biogeme?

Dear all, I'm currently working with panel data in Biogeme and trying to understand how to

4/24/25

Zahra Vakili, Michel Bierlaire2

4/13/25

Question Regarding Ordered Probit Model Results

> On 13 Apr 2025, at 10:12, Zahra Vakili <zahrava...@gmail.com> wrote: > > Dear

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Question Regarding Ordered Probit Model Results

> On 13 Apr 2025, at 10:12, Zahra Vakili <zahrava...@gmail.com> wrote: > > Dear

4/13/25

Natchaphon Leungbootnak, Michel Bierlaire2

4/8/25

RUM vs RRM in biogeme: Is it possible Final LL, AIC, BIC, and confusion matrix are exactly the same?

You've made a mistake. You have estimated twice the exact same model. Also, the concept of "

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RUM vs RRM in biogeme: Is it possible Final LL, AIC, BIC, and confusion matrix are exactly the same?

You've made a mistake. You have estimated twice the exact same model. Also, the concept of "

4/8/25

Natchaphon Leungbootnak, Michel Bierlaire2

4/8/25

The Norm of Gradient Issue in Mixed Logit Model with Panel Data

Try asc_ML_s = Beta('asc_ML_s', 10, -100, 100, 0) Also, estimate first a model ignoring the

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The Norm of Gradient Issue in Mixed Logit Model with Panel Data

Try asc_ML_s = Beta('asc_ML_s', 10, -100, 100, 0) Also, estimate first a model ignoring the

4/8/25

John Abraham, Michel Bierlaire3

4/8/25

Hello and a question about a parameter inside a log.

Hi John, > On 1 Apr 2025, at 23:06, John Abraham <j...@hbaspecto.com> wrote: > >

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Hello and a question about a parameter inside a log.

Hi John, > On 1 Apr 2025, at 23:06, John Abraham <j...@hbaspecto.com> wrote: > >

4/8/25

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