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 4 matches
- 05 Jan 2023, 01:53
- Forum: Model specification
- Topic: Specifying the latent variables in ICLV
- Replies: 5
- Views: 3175
Re: Specifying the latent variables in ICLV
Hello Prof. Hess, Thanks for your earlier reply. I ran the modified model with few improvements of the parameters estimates. This is the revised Apollo program code https://gist.github.com/ncctiglao/d33feaa020702f804f99c386de7df150 Further, may I inquire if it is possible to specify endogenous and e...
- 08 Dec 2022, 10:03
- Forum: Model specification
- Topic: Specifying the latent variables in ICLV
- Replies: 5
- Views: 3175
Re: Specifying the latent variables in ICLV
Hello Prof. Hess, Thanks for your reply. I made some edits on the program but the results are still not quite satisfactory. Here is the revised program https://gist.github.com/ncctiglao/d33feaa020702f804f99c386de7df150 That said, may I ask if there is a way to specify a single construct based on 4 l...
- 02 Dec 2022, 11:14
- Forum: Model specification
- Topic: Specifying the latent variables in ICLV
- Replies: 5
- Views: 3175
Re: Specifying the latent variables in ICLV
Hello Prof. Hess, Thanks for your quick feedback. I did take out the terms with gamma in the structural equations but the results have not improved. On the other hand, may I inquire if apollo has a notion of latent construct which are commonplace in structural equations modeling. The SEM model struc...
- 30 Nov 2022, 04:00
- Forum: Model specification
- Topic: Specifying the latent variables in ICLV
- Replies: 5
- Views: 3175
Specifying the latent variables in ICLV
Hello Prof. Hess, I am working on an ICLV model for bicycle to work decisions that is specified as a binary choice. I am trying to incorporate 4 latent variables namely safebiking, environment, easeoftravel and lowtraffic. The measurement model consists of 12 indicator variables which I have separat...