Fwd: FW: Respected professor, I am facing a problem of getting very high values of parameters, I also ran the model several times with carrying sigma values. For less no of draws e. g 50 draws its okay, but as I ran for 500 draws I got this issues. Can ...

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krishna bhattarai

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Sep 22, 2021, 3:23:35 AMSep 22
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---------- Forwarded message ---------
From: Krishna Bhattarai <kishubh...@outlook.com>
Date: Mon, Sep 20, 2021 at 2:46 PM
Subject: FW: Respected professor, I am facing a problem of getting very high values of parameters, I also ran the model several times with  changing sigma values  . For less no of draws e. g 50 draws its okay, but as I ran for 500 draws I got this issues. Can ...
To: krishna bhattarai <kishubh...@gmail.com>


 

 

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From: Krishna Bhattarai
Sent: Saturday, September 18, 2021 1:12 PM
To: Bierlaire Michel
Subject: Respected professor, I am facing a problem of getting very high values of parameters, I also ran the model several times with carrying sigma values. For less no of draws e. g 50 draws its okay, but as I ran for 500 draws I got this issues. Can you ...

 

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Viet Tu Nguyen

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Sep 27, 2021, 3:11:29 AMSep 27
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Hi professor Bierlaire and everyone,

I have also facing to this problem. Could anyone please explain what the problem is and how to fix it?

Thank you so much!
Vào lúc 14:23:35 UTC+7 ngày Thứ Tư, 22 tháng 9, 2021, kishubh...@gmail.com đã viết:

Bierlaire Michel

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Sep 27, 2021, 3:28:32 AMSep 27
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- 50 draws is definitely not enough.
- You should start with a logit mode, and make sure that your variables are scaled properly. Biogeme can give you some hints for scaling. 
- Once you have a logit model that makes sense, include random parameters.
- Use a high-performance computing facility. 4 threads are not enough. 
- Make sure you are using the latest version of Biogeme (3.8)

 

 

 

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krishna bhattarai

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Sep 27, 2021, 3:37:33 AMSep 27
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Thank you so much professor and team.


From: 'Bierlaire Michel' via Biogeme <bio...@googlegroups.com>
Sent: Monday, September 27, 2021 3:28:24 PM
To: viettu...@gmail.com <viettu...@gmail.com>
Cc: Bierlaire Michel <michel.b...@epfl.ch>; Biogeme <bio...@googlegroups.com>
Subject: Re: [biogeme] Respected professor, I am facing a problem of getting very high values of parameters, I also ran the model several times with carrying sigma values. For less no of draws e. g 50 draws its okay, but as I ran for 500 draws I got this is...
 
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