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
- 15 Dec 2021, 19:58
- Forum: Model specification
- Topic: Joint model of two discrete choices
- Replies: 3
- Views: 2968
Re: Joint model of two discrete choices
Stephan, thank you for your answer. May I ask if the parameters to be shared must be the betas of the regression, or there is another way to join both decisions (like using a random coefficient or a latent variable) while keeping independent/separate betas for every choice (ownership, preference of ...
- 11 Dec 2021, 20:30
- Forum: Model specification
- Topic: Joint model of two discrete choices
- Replies: 3
- Views: 2968
Joint model of two discrete choices
Dear David and Stephane, Thank you for your marvelous work with Apollo. I'm interested in estimating a joint model for ownership and use preference of motorcycle, using latent variables. I have a dataset from a survey where each responder answer the number of motorcycles owned and the frequency of u...
- 16 Feb 2021, 14:54
- Forum: Errors during model validation and/or estimation.
- Topic: Error when estimating a ICLV model with two sources of information
- Replies: 9
- Views: 11091
Re: Error when estimating a ICLV model with two sources of information
Thank you so much, using 1 core solved my issue. May I ask why is necessary to use only 1 core? as this makes the model run considerably slower.
Santiago.
Santiago.
- 28 Jan 2021, 16:26
- Forum: Errors during model validation and/or estimation.
- Topic: Error when estimating a ICLV model with two sources of information
- Replies: 9
- Views: 11091
Error when estimating a ICLV model with two sources of information
Dear Stephane and David, Thank you for developing the Apollo package, and thank you in advance for taking the time to read this issue. I'm trying to run a model with one (for the moment) LV. In this model, I have two sources of information where one is much bigger than the other (eodh = 21481 obs, a...