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
- 11 Jul 2022, 20:03
- Forum: Estimation results
- Topic: MNL estimates incorrect
- Replies: 5
- Views: 5675
Re: MNL estimates incorrect
Hi, I'm sorry for my late reply and thank you for your response. I've manually checked the data that I used in Apollo and in Stata and I haven't found any differences between them, besides the different format (long vs wide). You can see the head of both datasets below: Apollo format: Q10 task choic...
- 28 Jun 2022, 16:42
- Forum: Estimation results
- Topic: MNL estimates incorrect
- Replies: 5
- Views: 5675
Re: MNL estimates incorrect
Hi, Thank you for your fast reply. Unfortunaly, fixing none of this helps with the model - even when I remove ASC1 (in Stata, No choice is coded as ASC, so I left that one) from model specification and remove a couple of duplicates that I didn't notice earlier the model results remain different from...
- 26 Jun 2022, 20:07
- Forum: Estimation results
- Topic: MNL estimates incorrect
- Replies: 5
- Views: 5675
MNL estimates incorrect
Hello, I'm very new to choice modelling and I've been trying to analyse my data with Apollo, first starting with a simple MNL and then with a MIXL. However, the results that I get from a MNL with Apollo are completely different than those that I got with R package gmnl and in Stata (those also make ...