Thank you
I thought the LL should have improved when I used 1000 draws from 500.
Let men keep on trying with more draws.
Regards
Masimba
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Search found 9 matches
- 17 Jan 2022, 11:17
- Forum: Errors during model validation and/or estimation.
- Topic: estimation in WTP-space
- Replies: 30
- Views: 1573190
- 17 Jan 2022, 09:00
- Forum: Errors during model validation and/or estimation.
- Topic: estimation in WTP-space
- Replies: 30
- Views: 1573190
Re: estimation in WTP-space
I started with 200,500 then 1000 LOGNORMAL LL(note) : -3172.792 LL(200) : -1540.384 LL(500) : -1541.772 LL(1000) : -1542.743 LOGUNIFORM LL(note) : -3172.792 LL(200) : -1541.001 LL(500) : -1544.171
- 16 Jan 2022, 07:46
- Forum: Errors during model validation and/or estimation.
- Topic: estimation in WTP-space
- Replies: 30
- Views: 1573190
Re: estimation in WTP-space
Good day, David and Stephane, I hope you're all doing well. I am estimating a mixed logit for a public transport mode choice study with 3-time components, fare, and seating arrangement as variables. Like you advised the last time regarding how it doesn't make sense to assume Normal distribution for ...
- 31 Dec 2021, 11:55
- Forum: Errors during model validation and/or estimation.
- Topic: estimation in WTP-space
- Replies: 30
- Views: 1573190
Re: estimation in WTP-space
Thanks and happy holidays.
Regards
Masimba
Regards
Masimba
- 24 Dec 2021, 09:09
- Forum: Errors during model validation and/or estimation.
- Topic: estimation in WTP-space
- Replies: 30
- Views: 1573190
Re: estimation in WTP-space
Hi there could be many reasons for this, and it's difficult to diagnose without seeing your outputs, and also how they compare to the model with Normals. A Normal distribution for cost of course makes no sense, so you're right to try negative Lognormals. One thing to consider is whether your starti...
- 16 Dec 2021, 10:35
- Forum: Errors during model validation and/or estimation.
- Topic: n sqrt(diag(varcov)) : NaNs produced
- Replies: 4
- Views: 10406
Re: n sqrt(diag(varcov)) : NaNs produced
Thank you Stephane for your response. Having omitted gamma_incomes for class c, which I assume is equivalent to normalization, I still get the same error: -------------------------------------------------------------------------------------------------------------------------------------------------...
- 16 Dec 2021, 10:14
- Forum: Errors during model validation and/or estimation.
- Topic: n sqrt(diag(varcov)) : NaNs produced
- Replies: 4
- Views: 10406
Re: n sqrt(diag(varcov)) : NaNs produced
Thanks for your response. Having omitted the gamma_Incomes for class c which I suggest is equivalent to normalization as attached, I still get the same error: (Warning message: In sqrt(diag(robvarcov)) : NaNs produced ### Vector of parameters, including any that are kept fixed in estimation apollo_b...
- 16 Dec 2021, 09:30
- Forum: Errors during model validation and/or estimation.
- Topic: n sqrt(diag(varcov)) : NaNs produced
- Replies: 4
- Views: 10406
n sqrt(diag(varcov)) : NaNs produced
Good day, Stephane and David. I hope this finds you well. I’m estimating a latent class model with 3 classes and every time I introduce gamma variables to specify the class allocation utility function, I get NaN standard errors. I have tried to play around with the scaling function (trial and error)...
- 16 Dec 2021, 09:30
- Forum: Errors during model validation and/or estimation.
- Topic: n sqrt(diag(varcov)) : NaNs produced
- Replies: 0
- Views: 41736
n sqrt(diag(varcov)) : NaNs produced
Good day, Stephane and David. I hope this finds you well. I’m estimating a latent class model with 3 classes and every time I introduce gamma variables to specify the class allocation utility function, I get NaN standard errors. I have tried to play around with the scaling function (trial and error)...