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. We check the forum at least twice a week. It may thus take a couple of days for your post to appear and before we reply. There is no need to submit the post multiple times.
Search found 4 matches
- 20 Mar 2025, 11:59
- Forum: Model estimation
- Topic: The estimation method was changed to BFGS automatically.
- Replies: 2
- Views: 61405
Re: The estimation method was changed to BFGS automatically.
Thank you so much!
- 14 Mar 2025, 23:56
- Forum: Model estimation
- Topic: The estimation method was changed to BFGS automatically.
- Replies: 2
- Views: 61405
The estimation method was changed to BFGS automatically.
Dear experts,
When scripts were run on my PC, the estimation method was BGW. However, when they were run on Compute Canada's servers, the estimation method became BFGS automatically. I didn't change anything.
I want to use BGW on the servers because it gave better results in my case. However, I ...
When scripts were run on my PC, the estimation method was BGW. However, when they were run on Compute Canada's servers, the estimation method became BFGS automatically. I didn't change anything.
I want to use BGW on the servers because it gave better results in my case. However, I ...
- 27 Jun 2022, 13:35
- Forum: Model specification
- Topic: different numbers of alternatives for different choice observations
- Replies: 2
- Views: 7890
Re: different numbers of alternatives for different choice observations
Thank you, Stephane!
- 20 May 2022, 13:48
- Forum: Model specification
- Topic: different numbers of alternatives for different choice observations
- Replies: 2
- Views: 7890
different numbers of alternatives for different choice observations
Dear experts,
Can apollo package be used for an estimation based on a dataset in which different choice situations have different numbers of alternatives?
Thanks!
Can apollo package be used for an estimation based on a dataset in which different choice situations have different numbers of alternatives?
Thanks!