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  1. 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.
  2. 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
  3. Before asking a question on the forum, users are kindly requested to follow these steps:
    1. Check that the same issue has not already been addressed in the forum - there is a search tool.
    2. 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
    3. Check the frequently asked questions section on the Apollo website, which discusses some common issues/failures. Please see http://www.apollochoicemodelling.com/faq.html
    4. Make sure that R is using the latest official release of Apollo.
  4. If the above steps do not resolve the issue, then users should follow these steps when posting a question:
    1. provide full details on the issue, including the entire code and output, including any error messages
    2. posts will not immediately appear on the forum, but will be checked by a moderator first. We check the forum at least twice a week. It may thus take a couple of days for your post to appear and before we reply. There is no need to submit the post multiple times.

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by gabystephanie
09 Sep 2025, 11:30
Forum: Model specification
Topic: HCM model with casulity between latent factors
Replies: 8
Views: 96754

Re: HCM model with casulity between latent factors

Hi David,
I am sorry for bringing this thread back to life again because I really need your help.

I have a question, if i have this structure, and i want to estimate the indirect effect of BP on the choice utility, and the moderating effect of SC on BP influence on the choice utility.

X ----> BP ...
by gabystephanie
16 Jul 2025, 04:13
Forum: Model specification
Topic: ICLV model questions
Replies: 16
Views: 239982

Re: ICLV model questions

Dear Stephane,
I have a question about my model estimation. I have already estimated the MNL and MXL models, and now I’m trying to estimate the HCM. Specifically, I would like to estimate:
the indirect effect of BP on utility,
the influence of an attribute on BP, and
how SC moderates the ...
by gabystephanie
10 Mar 2025, 01:27
Forum: Model specification
Topic: Parameter does not influence the log-likelihood of your model!
Replies: 12
Views: 172295

Re: Parameter does not influence the log-likelihood of your model!

Hi Stephane and David,

Hope you are doing great!
I have been struggling with this issue for a while, and your help would be greatly appreciated.
I am trying to use the Apollo package to estimate the prior from my pilot test, but I keep getting this error message "Parameter does not influence the ...

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