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
- 16 Dec 2023, 17:37
- Forum: Post-estimation analysis/use of results
- Topic: Elasticity analysis for unlabeled alternatives
- Replies: 1
- Views: 60
Elasticity analysis for unlabeled alternatives
During the elasticity analysis using Apollo, I encountered a specific inquiry. The model under consideration involves four choice sets, comprising three unlabeled alternatives and a no-choice option, with the following utility specification: alt1 = b0+b1*x1_1+b2*x2_1 alt2 = b0+b1*x1_2+b2*x2_2 alt3 =...
- 05 Jan 2022, 09:35
- Forum: Models and estimation
- Topic: Question about HB MMNL model example output.
- Replies: 1
- Views: 5461
Question about HB MMNL model example output.
Dear all, I am a new user of Apollo, working on HB_MMNL model. I have some questions to interpret the model output. 1. I can see there are some different outputs of estimation. If I understand correctly, "Upper level model results” could be used to parameter estimates. Is it correct? 2. I have ...
- 28 Jun 2021, 05:45
- Forum: Other
- Topic: The following words in search query were ignored because they are too common words: robust, standard error, MDCEV
- Replies: 1
- Views: 7899
The following words in search query were ignored because they are too common words: robust, standard error, MDCEV
The forum search has a habit of rejecting the very words I want to search on, because it says they are too common. If it was just words like "the", "it", "why", that would make sense, but it's technical, relevant keywords, most of the time, like "robust", &quo...
- 19 Jun 2021, 21:34
- Forum: Model specification
- Topic: Specification of truncated normal distribution with random p
- Replies: 4
- Views: 6035
mixed logit model with truncated normal distribution
Dear sir or madam, Hi, I am trying to estimate mixed logit model w/ truncated normal distribution. I made code based on example 14. I had no problem when estimating mixed logit model w/ normal distribution or lognormal distribution. But confronted problem w/ truncated normal distribution. I used tru...