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.
Model specification and estimation
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Data preparation, processing and pre-estimation analysis
Ask questions about data format and processing of data, including the use of pre-estimation functions in Apollo. If your question relates to a specific error you are getting, please provide some of the output. - 20 Topics
- 79 Posts
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Last post
Re: Convert mlogit data forma…
by stephanehess View the latest post
02 Feb 2023, 13:23
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Model specification
Ask questions about model specifications. Ideally include a mathematical explanation of your proposed model. - 109 Topics
- 515 Posts
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Re: Dummy vs. linear coding
by stephanehess View the latest post
06 Mar 2023, 09:23
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Model estimation
Ask questions about how to estimate models and how to change your settings for estimation. - 25 Topics
- 104 Posts
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Re: Constraints do not work
by intllawKuma View the latest post
27 Nov 2022, 15:47
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Errors during model validation and/or estimation.
Ask questions about errors you encouunter. Please make sure to include full details about your model specifications, and ideally your model file. - 95 Topics
- 452 Posts
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Re: Error when weight column …
by stephanehess View the latest post
08 Mar 2023, 10:25
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06 Mar 2023, 09:23
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06 Mar 2023, 09:13
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Error: some utilities for component "MNL" contain values that are not finite numbers
by Shan » 24 Jan 2023, 10:55 - 6 Replies
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01 Mar 2023, 13:20
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Some eigenvalues of the Hessian are positive, indicating convergence to a saddle point!
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