Dear Stephane,
I actually get satisfactory results with the BFGS estimation method, so the problem is related to bgw estimation algorithm.
For the time being, I think I will not dig into it and take the results from BFGS for my research project.
Thanks for your help.
Beatrice Biondi
Important: Read this before posting to this forum
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Search found 7 matches
- 04 Jun 2024, 08:35
- Forum: Model estimation
- Topic: Function evaluation limit exceeded.
- Replies: 13
- Views: 1858
- 30 May 2024, 08:17
- Forum: Model estimation
- Topic: Function evaluation limit exceeded.
- Replies: 13
- Views: 1858
Re: Function evaluation limit exceeded.
Dear Stephane, it is not clear why the estimate of sig is very suspicious, 0.98783 is not much different from 1. You can find below the new output. converged Additional convergence test using scaled estimation. Parameters will be scaled by their current estimates and additional iterations will be pe...
- 29 May 2024, 14:24
- Forum: Model estimation
- Topic: Function evaluation limit exceeded.
- Replies: 13
- Views: 1858
Re: Function evaluation limit exceeded.
Dear Stephane, you can find below the output of the non-random model with the same specification. Model run by beatrice.biondi7 using Apollo 0.3.2 on R 4.3.1 for Windows. Please acknowledge the use of Apollo by citing Hess & Palma (2019) DOI 10.1016/j.jocm.2019.100170 www.ApolloChoiceModelling.c...
- 27 May 2024, 11:24
- Forum: Model estimation
- Topic: Function evaluation limit exceeded.
- Replies: 13
- Views: 1858
Re: Function evaluation limit exceeded.
Yes, here's the output (partial). Model run by beatrice.biondi7 using Apollo 0.3.2 on R 4.3.1 for Windows. Please acknowledge the use of Apollo by citing Hess & Palma (2019) DOI 10.1016/j.jocm.2019.100170 www.ApolloChoiceModelling.com Model name : Model_4 Model description : MDCEV model 4 Model ...
- 17 May 2024, 16:19
- Forum: Model estimation
- Topic: Function evaluation limit exceeded.
- Replies: 13
- Views: 1858
Re: Function evaluation limit exceeded.
Dear Stephane, the model worked with fixed parameters and interactions with demographics. Only the Mixed version had problems. I finally found what was going on. The Apollo manual says: "default is set to BFGS" for estimationRoutine in apollo_estimates. But actually, the default is using b...
- 15 May 2024, 15:51
- Forum: Model estimation
- Topic: Function evaluation limit exceeded.
- Replies: 13
- Views: 1858
Re: Function evaluation limit exceeded.
Dear Stephane, I am using a very simple specification, only random ASC for the eight alternatives, and I also tried with just 1% of the observations. Same result. I tried apollo_searchStart for Starting value search, I tried with different estimation algorithm, and I tried to act on tolerance inside...
- 07 May 2024, 13:29
- Forum: Model estimation
- Topic: Function evaluation limit exceeded.
- Replies: 13
- Views: 1858
Function evaluation limit exceeded.
Dear users, I am trying to estimate a Mixed MDCEV with only random ASC. The model does only an iteration zero and then stops with coefficients equal to their starting values. The output is displayed below, the warning says "function evaluation limit". I have 315 th. observations, with a pa...