Important: Read this before posting to this forum

  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. This may take a day or two at busy times. There is no need to submit the post multiple times.

Search found 3 matches

by doosun1
05 Jan 2022, 09:35
Forum: Models and estimation
Topic: Question about HB MMNL model example output.
Replies: 1
Views: 4201

Question about HB MMNL model example output.

Dear all, I am a new user of Apollo, working on HB_MMNL model. I have some questions to interpret the model output. 1. I can see there are some different outputs of estimation. If I understand correctly, "Upper level model results” could be used to parameter estimates. Is it correct? 2. I have ...
by doosun1
28 Jun 2021, 05:45
Forum: Other
Topic: The following words in search query were ignored because they are too common words: robust, standard error, MDCEV
Replies: 1
Views: 6446

The following words in search query were ignored because they are too common words: robust, standard error, MDCEV

The forum search has a habit of rejecting the very words I want to search on, because it says they are too common. If it was just words like "the", "it", "why", that would make sense, but it's technical, relevant keywords, most of the time, like "robust", &quo...
by doosun1
19 Jun 2021, 21:34
Forum: Model specification
Topic: Specification of truncated normal distribution with random p
Replies: 4
Views: 5888

mixed logit model with truncated normal distribution

Dear sir or madam, Hi, I am trying to estimate mixed logit model w/ truncated normal distribution. I made code based on example 14. I had no problem when estimating mixed logit model w/ normal distribution or lognormal distribution. But confronted problem w/ truncated normal distribution. I used tru...