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 3 matches
- 18 Apr 2024, 02:35
- Forum: Errors during model validation and/or estimation.
- Topic: Error in automating the MDCEV model specification
- Replies: 1
- Views: 763
Error in automating the MDCEV model specification
I am trying to automate the MDCEV model specification. I used the apollo MDCEV example (no outside good). I am getting an error (show below). Can someone please help me fix it. Thanks Sid Error in apollo_validate(mdcev_settings, modelType, functionality, apollo_inputs) : SPECIFICATION ISSUE - Labels...
- 20 Jan 2021, 16:26
- Forum: Post-estimation analysis/use of results
- Topic: Conditional value of travel time in Latent choice model
- Replies: 2
- Views: 4746
- 19 Jan 2021, 23:28
- Forum: Post-estimation analysis/use of results
- Topic: Conditional value of travel time in Latent choice model
- Replies: 2
- Views: 4746
Conditional value of travel time in Latent choice model
Hello everyone, 1. Explaination for equation - This is with reference to equation 9.4 in page 115 in Apollo Manual. Can someone please provide the reference of paper/book for details or explain the equation, to be more specific - how is likelihood different from probability for cross-sectional data....