Dear Stephane,
Good to know that the zero LLs within one class are okay.
When running the searchStart function, I get: "100 candidates removed due to non-finite starting LL. 0 remain."
Best regards,
Chris
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Search found 11 matches
- 15 Aug 2023, 11:09
- Forum: Errors during model validation and/or estimation.
- Topic: Joint model Log-likelihood fails at starting values
- Replies: 18
- Views: 8610
- 15 Aug 2023, 10:41
- Forum: Errors during model validation and/or estimation.
- Topic: Joint model Log-likelihood fails at starting values
- Replies: 18
- Views: 8610
Re: Joint model Log-likelihood fails at starting values
Dear Stephane, The entries with zero total likelihoods were all households that traveled many kilometers by motors/mopeds. I thus excluded all kms by private motorized modes that are not cars. The total likelihoods were never zero after this intervention. The likelihoods of kilometers traveled by mo...
- 10 Aug 2023, 10:55
- Forum: Errors during model validation and/or estimation.
- Topic: Joint model Log-likelihood fails at starting values
- Replies: 18
- Views: 8610
Re: Joint model Log-likelihood fails at starting values
Oh, I am afraid some are.
I will have a look at the original data behind the entries that resulted in zero LL_total.
Thank you,
Chris
I will have a look at the original data behind the entries that resulted in zero LL_total.
Thank you,
Chris
- 10 Aug 2023, 10:27
- Forum: Errors during model validation and/or estimation.
- Topic: Joint model Log-likelihood fails at starting values
- Replies: 18
- Views: 8610
Re: Joint model Log-likelihood fails at starting values
Dear Stephane, My apologies, see attached the LL for the combined model. This LL should be equal to the following equation: LL_total = log(P_c0*(L_car_c0*L_pt_c0*L_other_c0) + P_c1*(L_Car_c1*L_pt_c1*L_Other_c1) whereby L is the likelihood. The model successfully run in Biogeme, but I ran into proble...
- 08 Aug 2023, 14:13
- Forum: Errors during model validation and/or estimation.
- Topic: Joint model Log-likelihood fails at starting values
- Replies: 18
- Views: 8610
Re: Joint model Log-likelihood fails at starting values
Dear Stephane,
It seems that the loglikelihood is basically zero for some households (while reasonable for others).
For instance, the first 25 loglikelihoods of kilometers traveled are as attached.
What would you suggest?
Thank you,
Chris
It seems that the loglikelihood is basically zero for some households (while reasonable for others).
For instance, the first 25 loglikelihoods of kilometers traveled are as attached.
What would you suggest?
Thank you,
Chris
- Loglikelihoods_2class_model.png (75.22 KiB) Viewed 4891 times
- 16 Jul 2023, 10:05
- Forum: Errors during model validation and/or estimation.
- Topic: Joint model Log-likelihood fails at starting values
- Replies: 18
- Views: 8610
Re: Joint model Log-likelihood fails at starting values
Dear Stephane,
Thank you for the tip.
Something came up in the meantime, but I'll make sure to follow up after the holidays.
Best regards,
Chris
Thank you for the tip.
Something came up in the meantime, but I'll make sure to follow up after the holidays.
Best regards,
Chris
- 07 Jul 2023, 15:00
- Forum: Errors during model validation and/or estimation.
- Topic: Joint model Log-likelihood fails at starting values
- Replies: 18
- Views: 8610
Re: Joint model Log-likelihood fails at starting values
Dear Stephane,
Thank you.
I cannot share my data though: it is (very) privacy sensitive because it is based on residential addresses and license plates.
Best regards,
Chris
Thank you.
I cannot share my data though: it is (very) privacy sensitive because it is based on residential addresses and license plates.
Best regards,
Chris
- 07 Jul 2023, 13:43
- Forum: Errors during model validation and/or estimation.
- Topic: Joint model Log-likelihood fails at starting values
- Replies: 18
- Views: 8610
Re: Joint model Log-likelihood fails at starting values
*Apologies: an extended 2class version of this model.Yet, our intended 3class model did not work due to computational issues.
- 07 Jul 2023, 13:42
- Forum: Errors during model validation and/or estimation.
- Topic: Joint model Log-likelihood fails at starting values
- Replies: 18
- Views: 8610
Re: Joint model Log-likelihood fails at starting values
Dear Stephane, We are fairly certain there are no circular dependencies in the model. The estimation issue seems to be purely numerical/computational. We did get a simplified 2class version of this model (km/mode for car-owning and carless households) working in biogeme. The results were sensible. B...
- 07 Jul 2023, 11:50
- Forum: Errors during model validation and/or estimation.
- Topic: Joint model Log-likelihood fails at starting values
- Replies: 18
- Views: 8610
Re: Joint model Log-likelihood fails at starting values
Dear Stephane, Thank you for your very quick reply. Does this help? ... Whereby ld is a parameter representing the log of kilometers traveled, U is the utility of each mode m, F is the fraction of kilometers traveled per mode m, and dm is the number of kilometers traveled with mode m (the target var...