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 4 matches

by anders
19 Oct 2023, 20:37
Forum: Errors during model validation and/or estimation.
Topic: Unconditionals
Replies: 13
Views: 121584

Re: Unconditionals

Thank you very much, Stephane. I am now defining betas inside apollo_lcPars, it provides me with the same results as my previous code. I run the following code: ### Clear memory rm(list = ls()) gc() ### Load Apollo library #library(apollo) ### Initialise code apollo_initialise() ### Set core control...
by anders
17 Oct 2023, 21:30
Forum: Errors during model validation and/or estimation.
Topic: Unconditionals
Replies: 13
Views: 121584

Re: Unconditionals

Hi, I think this has to do with estimating a latent class mixed logit model for attribute non-attendance. I am struggeling with the same problem of extracting unconditionals after successfully estimating a latent class mixed logit model with complete ANA structure. I suspect it is because one class ...
by anders
30 Sep 2020, 14:18
Forum: Model specification
Topic: Second order latent variable
Replies: 3
Views: 6357

Re: Second order latent variable

Thank you very much, Stephane. I guess you need to define all three latent variables in the utility function to get the model to run? In general, I am only interested in incorporating LV3 in the utility function in your example for example through interaction terms, but then the model can't run beca...
by anders
31 Aug 2020, 07:35
Forum: Model specification
Topic: Second order latent variable
Replies: 3
Views: 6357

Second order latent variable

Dear Hess and Palma,

I was wondering whether it is possible to define and incorporate a second-order latent variable in a hybrid choice model using Apollo? So a latent variable which is defined by the combination of two first-order latent variables.

Thank you very much
Anders