Thank you so much for the suggestions.
Ram
Important: Read this before posting to this forum
- This forum is for questions related to the use of Apollo. We will answer some general choice modelling questions too, where appropriate, and time permitting. We cannot answer questions about how to estimate choice models with other software packages.
- There is a very detailed manual for Apollo available at http://www.ApolloChoiceModelling.com/manual.html. This contains detailed descriptions of the various Apollo functions, and numerous examples are available at http://www.ApolloChoiceModelling.com/examples.html. In addition, help files are available for all functions, using e.g. ?apollo_mnl
- Before asking a question on the forum, users are kindly requested to follow these steps:
- Check that the same issue has not already been addressed in the forum - there is a search tool.
- Ensure that the correct syntax has been used. For any function, detailed instructions are available directly in Apollo, e.g. by using ?apollo_mnl for apollo_mnl
- Check the frequently asked questions section on the Apollo website, which discusses some common issues/failures. Please see http://www.apollochoicemodelling.com/faq.html
- Make sure that R is using the latest official release of Apollo.
- Users can check which version they are running by entering packageVersion("apollo").
- Then check what is the latest full release (not development version) at http://www.ApolloChoiceModelling.com/code.html.
- To update to the latest official version, just enter install.packages("apollo"). To update to a development version, download the appropriate binary file from http://www.ApolloChoiceModelling.com/code.html, and install the package from file
- If the above steps do not resolve the issue, then users should follow these steps when posting a question:
- provide full details on the issue, including the entire code and output, including any error messages
- posts will not immediately appear on the forum, but will be checked by a moderator first. This may take a day or two at busy times. There is no need to submit the post multiple times.
Search found 5 matches
- 16 Jun 2023, 17:45
- Forum: Estimation results
- Topic: Mixed logit model result
- Replies: 4
- Views: 4764
- 15 Jun 2023, 17:11
- Forum: Errors during model validation and/or estimation.
- Topic: Error MDCEV estimation - covariance matrix cannot be computed
- Replies: 9
- Views: 3646
Re: Error MDCEV estimation - covariance matrix cannot be computed
Thank you. I understood it now.
Ram
Ram
- 15 Jun 2023, 17:09
- Forum: Estimation results
- Topic: Mixed logit model result
- Replies: 4
- Views: 4764
Re: Mixed logit model result
Dr. Hess, Thank you so much for the response. I did not start with an MNL model and build on it. What I did, I started with MMNL model with uncorrelated parameters and then run the MMNL model with correlated parameters. I again tried to run the MMNL model with correlated parameters using 1,000 draws...
- 11 Jun 2023, 16:30
- Forum: Errors during model validation and/or estimation.
- Topic: Error MDCEV estimation - covariance matrix cannot be computed
- Replies: 9
- Views: 3646
Re: Error MDCEV estimation - covariance matrix cannot be computed
Dr. Hess,stephanehess wrote: ↑15 Sep 2022, 19:03 Hi
if you look at your output, Apollo tells you that the model hasn't converged - you have reached the maximum number of iterations. Please try with a higher limit
Stephane
What is "a higher limit" mean? Do you mean we should increase the number of draws?
Ram
- 11 Jun 2023, 16:15
- Forum: Estimation results
- Topic: Mixed logit model result
- Replies: 4
- Views: 4764
Mixed logit model result
Dr. Hess, I am running a mixed logit model (correlated preference space) for a choice experiment (3 alternatives including a status quo). In attached results (I removed matrix related results due to space limitations), land, dist, density, buck, cwd and fee are choice specific variables, and Q4_leas...