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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 lucamariani96
28 Oct 2025, 10:25
Forum: Model specification
Topic: Doubts about model specification with an alternative vs. status quo
Replies: 5
Views: 73522

Re: Doubts about model specification with an alternative vs. status quo

Hello Stephane,
thanks again for your help.
If I may, one last thing: what do you mean about plotting them? I apologize but I don't get what should I plot and against what should I plot it.
If you could help me out with this as well I would be super grateful.
Best,
Luca
by lucamariani96
13 Oct 2025, 15:41
Forum: Model specification
Topic: Doubts about model specification with an alternative vs. status quo
Replies: 5
Views: 73522

Re: Doubts about model specification with an alternative vs. status quo

Hello Stephane,
thanks for your answer and your invaluable help.
Regarding the questions:
1) I posed the question incorrectly. My doubt refers to using a logit model (so a binary choice) versus a multinomial logit (a choice among three or more alternatives). In my case I choose between two ...
by lucamariani96
10 Oct 2025, 11:32
Forum: Model specification
Topic: Doubts about model specification with an alternative vs. status quo
Replies: 5
Views: 73522

Doubts about model specification with an alternative vs. status quo

Hello!

First of all, thanks prof. Hess and prof. Palma for creating such a useful package and being so helpful towards us normal people that use it.

I am writing here to ask about a DCE that I have created and that I am trying to analyse using Apollo.

I have to admit that statistics is not my ...

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