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 2 matches
- 30 Jan 2024, 02:19
- Forum: Feature requests
- Topic: A data contain too many observations for each person even workInLogs=TRUE
- Replies: 3
- Views: 3219
Re: A data contain too many observations for each person even workInLogs=TRUE
Thank you for your suggestion. Yes, I have a large number of choices for each person. The number of individuals is about 5,000. Therefore, the data contains 9M rows. This was the first time I tried Apollo after being unable to estimate with various other packages. Because Apollo makes explicit what ...
- 29 Jan 2024, 03:58
- Forum: Feature requests
- Topic: A data contain too many observations for each person even workInLogs=TRUE
- Replies: 3
- Views: 3219
A data contain too many observations for each person even workInLogs=TRUE
Hi, I am working with a choice model that a person is observed about 2300 times of up to 7 alternatives. In this data, even I use "workInLogs=TRUE", R reached the numerical limits on the choice probability when I use apollo_panelProd. (e.g. exp(log(0.14)*2300) = 0) I try to use "Rmpfr...