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.
- 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.
It is currently 26 Nov 2022, 16:33
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Installation and updating
Ask questions about installing Apollo, running it inside a shell, and updating to new versions. Please make sure you provide information about which version of Apollo and R you are using. - 3 Topics
- 13 Posts
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Last post
Re: Installing when R is run …
by Victor View the latest post
17 Jul 2020, 17:14
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Bug reports
Report bugs or highlight issues with Apollo functions. At a minimum, please include the part of the output where you believe the bug is manifested. Ideally, please share your model file. - 25 Topics
- 94 Posts
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Last post
Re: Jupyter IRkernel compatib…
by dpalma View the latest post
25 Nov 2022, 16:53
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Feature requests
Put in requests for new capabilities such as functions for new models. - 10 Topics
- 33 Posts
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Re: File path of model outputs
by stephanehess View the latest post
15 Jul 2022, 17:15
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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. - 17 Topics
- 73 Posts
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Last post
Re: Data cleaning
by stephanehess View the latest post
25 Sep 2022, 02:29
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Model specification
Ask questions about model specifications. Ideally include a mathematical explanation of your proposed model. - 99 Topics
- 484 Posts
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Last post
Re: Latent Class BWS Model an…
by stephanehess View the latest post
26 Nov 2022, 07:15
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Model estimation
Ask questions about how to estimate models and how to change your settings for estimation. - 25 Topics
- 102 Posts
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Last post
Re: Constraints do not work
by dpalma View the latest post
25 Nov 2022, 16:17
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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. - 86 Topics
- 403 Posts
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Last post
Re: MDCEV model with perhaps …
by Miller Cooker View the latest post
25 Nov 2022, 18:56
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Estimation results
Ask questions about the results reported after estimation. If the output includes errors, please include your model code if possible. - 25 Topics
- 129 Posts
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Last post
Re: Positive alternative spec…
by stephanehess View the latest post
25 Nov 2022, 13:33
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Post-estimation analysis/use of results
Ask questions about post-estimation functions (e.g. prediction, conditionals, etc) or other processing of results. - 61 Topics
- 283 Posts
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Re: Error in model predictions
by dpalma View the latest post
25 Nov 2022, 17:10
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Questions about manual
Ask questions about the Apollo manual. - 1 Topics
- 2 Posts
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Re: DoIs in Manual
by stephanehess View the latest post
11 Feb 2021, 17:03
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Examples (existing and requests for new ones)
Ask questions about existing examples and put in requests to software developers and users for other example implementations of models. - 16 Topics
- 65 Posts
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Re: ASCs in RRM example
by stephanehess View the latest post
25 Nov 2022, 13:44
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Data
Ask general questions about data for choice modelling that are not Apollo specific but relevant to Apollo users. - 1 Topics
- 8 Posts
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Re: Data set with missing val…
by stephanehess View the latest post
08 Apr 2022, 13:16
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Models and estimation
Ask general questions about model specification and estimation that are not Apollo specific but relevant to Apollo users. - 23 Topics
- 100 Posts
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Last post
Re: MIXL model with a lot of …
by stephanehess View the latest post
25 Nov 2022, 19:14
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- 3 Topics
- 6 Posts
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Last post
Re: Experiment design with Ap…
by dpalma View the latest post
18 Mar 2022, 16:12
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