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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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Osama Hassan, Michel Bierlaire2

Apr 17

Inquiry about the test file

The message says: Database has no entry. Did you load the data? > On 16 Apr 2025, at 19:24, Osama

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Inquiry about the test file

The message says: Database has no entry. Did you load the data? > On 16 Apr 2025, at 19:24, Osama

Apr 17

Zahra Vakili, Michel Bierlaire2

Apr 13

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

Apr 13

Natchaphon Leungbootnak, Michel Bierlaire2

Apr 8

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 "

Apr 8

Natchaphon Leungbootnak, Michel Bierlaire2

Apr 8

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

Apr 8

John Abraham, Michel Bierlaire3

Apr 8

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: > >

Apr 8

Apr 1

Unexpected Results in Logit Model with Repeated Choices in Biogeme

Dear all: I'm currently building a logit model in Biogeme. In my setup, each respondent makes a

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Unexpected Results in Logit Model with Repeated Choices in Biogeme

Dear all: I'm currently building a logit model in Biogeme. In my setup, each respondent makes a

Apr 1

Mar 31

RuntimeError: Value 0 out of range – Even in minimal working model

Hello Biogeme team, I'm encountering a persistent RuntimeError when estimating even a minimal

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RuntimeError: Value 0 out of range – Even in minimal working model

Hello Biogeme team, I'm encountering a persistent RuntimeError when estimating even a minimal

Mar 31

Natchaphon Leungbootnak, Michel Bierlaire3

Mar 25

Panel data: Simulate prediction results at the observation level instead of individual level

For my understanding, when I run the code, I have to set up the df_train as the panel data. However,

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Panel data: Simulate prediction results at the observation level instead of individual level

For my understanding, when I run the code, I have to set up the df_train as the panel data. However,

Mar 25

Natchaphon Leungbootnak

Mar 23

Panel data: How to simulate prediction results at the observation level instead of individual levelof

Dear Professor Bierlaire, I have a panel dataset that contains 'randid' (individual traveler)

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Panel data: How to simulate prediction results at the observation level instead of individual levelof

Dear Professor Bierlaire, I have a panel dataset that contains 'randid' (individual traveler)

Mar 23

Muhammad Kalifardi, Michel Bierlaire2

Mar 17

Error in Installation

It seems that you have a package that request an old version of numpy. The best solution is to create

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Error in Installation

It seems that you have a package that request an old version of numpy. The best solution is to create

Mar 17

Mar 12

Simulation for an ordered hybrid choice model

Dear Professor Bierlaire, I am trying to simulate a hybrid choice model with a single ordered choice

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Simulation for an ordered hybrid choice model

Dear Professor Bierlaire, I am trying to simulate a hybrid choice model with a single ordered choice

Mar 12

ענבל גליקמן, Michel Bierlaire4

Mar 11

Incorporating a Latent Variable in an MNL Model

: :I tried using the method from the explanation file you sent me, and I formulated the model as

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Incorporating a Latent Variable in an MNL Model

: :I tried using the method from the explanation file you sent me, and I formulated the model as

Mar 11

Mike Sri, Michel Bierlaire2

Mar 3

Ordered logit predicted value used as 2SLS

Yes, it is possible. The syntax would be similar to the one used for hydrid choice models. Have a

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Ordered logit predicted value used as 2SLS

Yes, it is possible. The syntax would be similar to the one used for hydrid choice models. Have a

Mar 3

Lotte Notelaers, Michel Bierlaire2

Feb 25

MNL model using panel data and weights

> On 24 Feb 2025, at 16:43, Lotte Notelaers <lo...@wearenutz.com> wrote: > > Dear prof

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MNL model using panel data and weights

> On 24 Feb 2025, at 16:43, Lotte Notelaers <lo...@wearenutz.com> wrote: > > Dear prof

Feb 25

Natchaphon Leungbootnak, Michel Bierlaire2

Feb 20

Modified Utilities Function

You should not use the mathematical expressions from the `math` package, but from the biogeme.

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Modified Utilities Function

You should not use the mathematical expressions from the `math` package, but from the biogeme.

Feb 20

可可, Michel Bierlaire7

Feb 12

Integrate() to deal 2-dimension integration

Thank you for your reply！ So if we rewrite the mathematical formula in this form, will it correspond

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Integrate() to deal 2-dimension integration

Thank you for your reply！ So if we rewrite the mathematical formula in this form, will it correspond

Feb 12

Saptarshi Sen, Michel Bierlaire2

Feb 11

Draws are defined outside the MonteCarlo operator

You forgot to integrate. MonteCarlo(elas_Bus_time) > On 11 Feb 2025, at 13:12, Saptarshi Sen <

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Draws are defined outside the MonteCarlo operator

You forgot to integrate. MonteCarlo(elas_Bus_time) > On 11 Feb 2025, at 13:12, Saptarshi Sen <

Feb 11

Dali Hajilari, Michel Bierlaire2

Feb 9

Identification issue

My guess is that you are trying to estimate both the constant and the thresholds. One of them must be

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Identification issue

My guess is that you are trying to estimate both the constant and the thresholds. One of them must be

Feb 9

Feb 7

Numerical integration and Monte-Carlo integration to deal 2-dimension problem

Dear Biogeme-group, I set two latent variables, CC and AA, when I calibrated the ICLV model. Can I

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Numerical integration and Monte-Carlo integration to deal 2-dimension problem

Dear Biogeme-group, I set two latent variables, CC and AA, when I calibrated the ICLV model. Can I

Feb 7

R Morales, Michel Bierlaire3

Jan 28

NL Combining RP & SP data

The best way to think about it is to start by developing first a model for RP data, and,

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NL Combining RP & SP data

The best way to think about it is to start by developing first a model for RP data, and,

Jan 28

Rachel Murray-Watson, Michel Bierlaire3

Jan 27

Socio-economic factors in choice models with latent variables

No. But a large number of classes (that is, 3 or more) generate a likelihood function with many local

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Socio-economic factors in choice models with latent variables

No. But a large number of classes (that is, 3 or more) generate a likelihood function with many local

Jan 27

Jeppe Rich, Michel Bierlaire3

Jan 25

Is the a bioAtan function?

I know (-: it's for some weird functional stuff I'm working on. It is just that; t <- 2/pi

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Is the a bioAtan function?

I know (-: it's for some weird functional stuff I'm working on. It is just that; t <- 2/pi

Jan 25

Rachel Murray-Watson

Jan 25

3-class discrete mixture model

In the following, I am struggling to extend it to three classes. Particularly at this step:

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3-class discrete mixture model

In the following, I am struggling to extend it to three classes. Particularly at this step:

Jan 25

R Morales, Michel Bierlaire2

12/19/24

Market shares and ASC (RP & SP)

This is called "constant recalibration". See Section 2.8 of Train's book. https://eml.

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Market shares and ASC (RP & SP)

This is called "constant recalibration". See Section 2.8 of Train's book. https://eml.

12/19/24

ענבל גליקמן, Michel Bierlaire3

12/15/24

Thanks for your response. Tried your suggestion, still same warning: Warning: identification issue

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Thanks for your response. Tried your suggestion, still same warning: Warning: identification issue

12/15/24

Michel Bierlaire

12/13/24

Re: Problem in Biogeme code for Nested logit Model

It is likely that you do not have installed the latest version. The call of the function looks

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Re: Problem in Biogeme code for Nested logit Model

It is likely that you do not have installed the latest version. The call of the function looks

12/13/24

Anna Reiffer, Michel Bierlaire2

11/20/24

MDCEV outside good definition

> On 20 Nov 2024, at 10:04, Anna Reiffer <annar...@gmail.com> wrote: > > Hi, >

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MDCEV outside good definition

> On 20 Nov 2024, at 10:04, Anna Reiffer <annar...@gmail.com> wrote: > > Hi, >

11/20/24

Luca Bataillard, Michel Bierlaire2

11/19/24

Biogeme 3.2.14 - piecewise_variables raises when expression is not of type Variable

Hi Luca, I decided to restrict the use to variables in order to avoid meaningless specifications when

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Biogeme 3.2.14 - piecewise_variables raises when expression is not of type Variable

Hi Luca, I decided to restrict the use to variables in order to avoid meaningless specifications when

11/19/24

Amir pashaie, Michel Bierlaire2

11/11/24

The current release, Biogeme 3.2.14, relies on numpy 2.0.0. https://github.com/michelbierlaire/

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The current release, Biogeme 3.2.14, relies on numpy 2.0.0. https://github.com/michelbierlaire/

11/11/24

Amparo Álvarez, Michel Bierlaire3

11/9/24

The database contains an object error Biogeme

After the code df['column_name'] = pd.to_numeric(df['column_name']) the database is

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The database contains an object error Biogeme

After the code df['column_name'] = pd.to_numeric(df['column_name']) the database is

11/9/24

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