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
- 05 Jan 2023, 10:58
- Forum: Post-estimation analysis/use of results
- Topic: From most likely value to characteristics across classes
- Replies: 1
- Views: 3991
From most likely value to characteristics across classes
Hi, I have a question about calculating the characteristics across classes. For example, I have the covariate age in my model, this is divided into three categories: youth, young-adults and middle-aged adults. I've managed to find the most likely value per class: X1 X2 X3 2.107134 2.281334 1.961140 ...
- 03 Jan 2023, 13:27
- Forum: Errors during model validation and/or estimation.
- Topic: Some eigenvalues of the Hessian are positive, indicating convergence to a saddle point!
- Replies: 1
- Views: 1064
Some eigenvalues of the Hessian are positive, indicating convergence to a saddle point!
Hi, I have a problem with estimating my LCCM. When I estimate a 4-class model for example, I get the following warnings: 1. WARNING: Some eigenvalues of the Hessian are positive, indicating convergence to a saddle point! 2. Warning message: In sqrt(diag(varcov)) : NaNs produced 3. Some eigenvalues o...
- 02 Jan 2023, 11:27
- Forum: Estimation results
- Topic: rho square
- Replies: 3
- Views: 9706
Re: rho square
Hi, Currently, I am working on understanding and interpreting the estimation results of my MNL model. In the output, the following is given: LL(start) : -2145.59 LL at equal shares, LL(0) : -2145.59 LL at observed shares, LL(C) : -2097.69 LL(final) : -1828.9 Rho-squared vs equal shares : 0.1476 Adj....