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 4 matches
- 12 Dec 2023, 20:40
- Forum: Estimation results
- Topic: When to use robust standard errors and "normal" standard errors?
- Replies: 1
- Views: 1130
When to use robust standard errors and "normal" standard errors?
Hi! I have been consistently looking at robust standard errors and t-ratios when interpreting my results (I'm conducting a choice experiment and I analyse the results through multinominal and mixed logit models in Apollo). Now I have become in doubt as to whether I should have focused on the "n...
- 19 Oct 2023, 15:54
- Forum: Model specification
- Topic: Bimodal/multimodal distribution of mixed logit random coefficients
- Replies: 4
- Views: 11902
Re: Bimodal/multimodal distribution of mixed logit random coefficients
Thank you so much, now it works.
- 13 Oct 2023, 12:08
- Forum: Model specification
- Topic: Bimodal/multimodal distribution of mixed logit random coefficients
- Replies: 4
- Views: 11902
Re: Bimodal/multimodal distribution of mixed logit random coefficients
Hi Stephane
Thank you so much for responding. I'm afraid I've read the paper, but I don't seem to understand it well enough to be able to implement the approach in Apollo... You wouldn't happen to have a piece of code where the approach is used inside apollo_randCoeff, would you?
Best wishes
Pea
Thank you so much for responding. I'm afraid I've read the paper, but I don't seem to understand it well enough to be able to implement the approach in Apollo... You wouldn't happen to have a piece of code where the approach is used inside apollo_randCoeff, would you?
Best wishes
Pea
- 07 Oct 2023, 16:22
- Forum: Model specification
- Topic: Bimodal/multimodal distribution of mixed logit random coefficients
- Replies: 4
- Views: 11902
Bimodal/multimodal distribution of mixed logit random coefficients
Hi! In Hess and Palma (2019) on page 15, it is shown how to make the random coefficients in a mixed logit follow a negative Lognormal distribution, a symmetrical Triangular distribution and a Johnson SB distribution, using Apollo. Is it also possible to make them follow a bimodal or multimodal distr...